Number of the day: 13404037

Properties of the number 13404037:

13404037 is a cyclic number.
13404037 = 2053 × 6529 is semiprime and squarefree.
13404037 has 2 distinct prime factors, 4 divisors, 39 antidivisors and 13395456 totatives.
13404037 has a semiprime digit sum 22 in base 10.
Reversing the decimal digits of 13404037 results in an emirpimes.
13404037 = 6702019² - 6702018² = 4291² - 2238² is the difference of 2 nonnegative squares in 2 ways.
13404037 is the sum of 2 positive triangular numbers.
13404037 is the difference of 2 positive pentagonal numbers in 2 ways.
13404037 = 1914² + 3121² = 911² + 3546² is the sum of 2 positive squares in 2 ways.
13404037 = 111² + 200² + 3654² is the sum of 3 positive squares.
13404037² = 6460812² + 11744195² = 3943813² + 12810720² = 6077245² + 11947188² = 9323412² + 9630275² is the sum of 2 positive squares in 4 ways.
13404037² is the sum of 3 positive squares.
13404037 is a proper divisor of 491⁶⁸⁴ - 1.
13404037 is an emirpimes in (at least) the following bases: 4, 10, 14, 23, 25, 31, 33, 35, 38, 40, 41, 49, 51, 53, 54, 55, 56, 62, 64, 65, 67, 70, 74, 83, 86, 87, 93, 95, and 99.