990155956 has 24 divisors (see below), whose sum is σ = 1873742976. Its totient is φ = 456040320.

The previous prime is 990155953. The next prime is 990155963. The reversal of 990155956 is 659551099.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990155953) 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, 151710 + ... + 158101.

It is an arithmetic number, because the mean of its divisors is an integer number (78072624).

Almost surely, 2^990155956 is an apocalyptic number.

It is an amenable number.

990155956 is a deficient number, since it is larger than the sum of its proper divisors (883587020).

990155956 is a wasteful number, since it uses less digits than its factorization.

990155956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309879 (or 309877 counting only the distinct ones).

The product of its (nonzero) digits is 546750, while the sum is 49.

The square root of 990155956 is about 31466.7436510358. The cubic root of 990155956 is about 996.7078254809.

The spelling of 990155956 in words is "nine hundred ninety million, one hundred fifty-five thousand, nine hundred fifty-six".