Number of the day: 874427

Properties of the number 874427:

874427 is a cyclic number.
874427 is the 69406^th prime.
874427 has 25 antidivisors and 874426 totatives.
Reversing the decimal digits of 874427 results in a sphenic number.
874427 = 437214² - 437213² is the difference of 2 nonnegative squares in 1 way.
874427 is the difference of 2 positive pentagonal numbers in 1 way.
874427 = 9² + 11² + 935² is the sum of 3 positive squares.
874427² is the sum of 3 positive squares.
874427 is a proper divisor of 41⁶²⁴⁵⁹ - 1.
874427 = '87' + '4427' is the concatenation of 2 semiprime numbers.
874427 is an emirp in (at least) the following bases: 8, 11, 14, 19, 23, 27, 38, 47, 48, 54, 61, 69, 78, 81, 83, 88, 92, 93, and 97.

The number 874427 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequence (among others):

Sequence number and description below are taken from OEIS.
A245466: a(n) = sigma_1(1) + sigma_2(2) + sigma_3(3) + ... + sigma_n-1(n-1) + sigma_n(n).