990153923 has 8 divisors (see below), whose sum is σ = 1084374000. Its totient is φ = 896634880.

The previous prime is 990153911. The next prime is 990153947. The reversal of 990153923 is 329351099.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 990153923 - 2⁴ = 990153907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990153953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172298 + ... + 177951.

It is an arithmetic number, because the mean of its divisors is an integer number (135546750).

Almost surely, 2^990153923 is an apocalyptic number.

990153923 is a deficient number, since it is larger than the sum of its proper divisors (94220077).

990153923 is a wasteful number, since it uses less digits than its factorization.

990153923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350517.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 990153923 is about 31466.7113470728. The cubic root of 990153923 is about 996.7071433297.

The spelling of 990153923 in words is "nine hundred ninety million, one hundred fifty-three thousand, nine hundred twenty-three".