990257923 has 8 divisors (see below), whose sum is σ = 1005834240. Its totient is φ = 974705160.

The previous prime is 990257897. The next prime is 990257959. The reversal of 990257923 is 329752099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990257923 is a prime.

It is a super-2 number, since 2×990257923² = 1961221508128547858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990257963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91278 + ... + 101548.

It is an arithmetic number, because the mean of its divisors is an integer number (125729280).

Almost surely, 2^990257923 is an apocalyptic number.

990257923 is a deficient number, since it is larger than the sum of its proper divisors (15576317).

990257923 is a wasteful number, since it uses less digits than its factorization.

990257923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11777.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 990257923 is about 31468.3638437082. The cubic root of 990257923 is about 996.7420382120.

The spelling of 990257923 in words is "nine hundred ninety million, two hundred fifty-seven thousand, nine hundred twenty-three".