Number of the day: 285694

Nikolai Lobachevsky was born on this day 225 years ago.

Properties of the number 285694:

285694 = 2 × 211 × 677 is a sphenic number and squarefree.
285694 has 3 distinct prime factors, 8 divisors, 51 antidivisors and 141960 totatives.
285694 has a semiprime digit sum 34 in base 10.
285694 has a Fibonacci digit sum 34 in base 10.
Reversing the decimal digits of 285694 results in a semiprime.
285694 is the sum of 2 positive triangular numbers.
285694 is the difference of 2 positive pentagonal numbers in 3 ways.
285694 = 22² + 57² + 531² is the sum of 3 positive squares.
285694² = 21944² + 284850² is the sum of 2 positive squares in 1 way.
285694² is the sum of 3 positive squares.
285694 is a proper divisor of 1811⁹¹ - 1.
285694 is palindromic in (at least) the following bases: -7, and -92.
285694 in base 26 = g6g6 and consists of only the digits '6' and 'g'.

The number 285694 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequence (among others):

Sequence number and description below are taken from OEIS.
A173674: ceil[A003269(n)/2].