921665452 has 12 divisors (see below), whose sum is σ = 1697804920. Its totient is φ = 436578336.

The previous prime is 921665447. The next prime is 921665497. The reversal of 921665452 is 254566129.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 6063513 + ... + 6063664.

Almost surely, 2^921665452 is an apocalyptic number.

It is an amenable number.

921665452 is a deficient number, since it is larger than the sum of its proper divisors (776139468).

921665452 is a wasteful number, since it uses less digits than its factorization.

921665452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12127200 (or 12127198 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 921665452 is about 30358.9435257553. The cubic root of 921665452 is about 973.1753564944.

The spelling of 921665452 in words is "nine hundred twenty-one million, six hundred sixty-five thousand, four hundred fifty-two".