990923425 has 12 divisors (see below), whose sum is σ = 1229354476. Its totient is φ = 792345600.

The previous prime is 990923407. The next prime is 990923443. The reversal of 990923425 is 524329099.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (990923407) and next prime (990923443).

It can be written as a sum of positive squares in 6 ways, for example, as 122855056 + 868068369 = 11084^2 + 29463^2 .

It is not a de Polignac number, because 990923425 - 2⁹ = 990922913 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48337 + ... + 65713.

Almost surely, 2^990923425 is an apocalyptic number.

It is an amenable number.

990923425 is a deficient number, since it is larger than the sum of its proper divisors (238431051).

990923425 is a wasteful number, since it uses less digits than its factorization.

990923425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19668 (or 19663 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 990923425 is about 31478.9362113779. The cubic root of 990923425 is about 996.9652747589.

The spelling of 990923425 in words is "nine hundred ninety million, nine hundred twenty-three thousand, four hundred twenty-five".