921865136 has 20 divisors (see below), whose sum is σ = 1811272464. Its totient is φ = 454440000.

The previous prime is 921865111. The next prime is 921865169. The reversal of 921865136 is 631568129.

It is a junction number, because it is equal to n+sod(n) for n = 921865093 and 921865102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404615 + ... + 406886.

Almost surely, 2^921865136 is an apocalyptic number.

It is an amenable number.

921865136 is a deficient number, since it is larger than the sum of its proper divisors (889407328).

921865136 is a wasteful number, since it uses less digits than its factorization.

921865136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811580 (or 811574 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 921865136 is about 30362.2320655119. The cubic root of 921865136 is about 973.2456327228.

The spelling of 921865136 in words is "nine hundred twenty-one million, eight hundred sixty-five thousand, one hundred thirty-six".