990815902 has 8 divisors (see below), whose sum is σ = 1486422936. Its totient is φ = 495341592.

The previous prime is 990815869. The next prime is 990815927. The reversal of 990815902 is 209518099.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11748 + ... + 46039.

It is an arithmetic number, because the mean of its divisors is an integer number (185802867).

Almost surely, 2^990815902 is an apocalyptic number.

990815902 is a deficient number, since it is larger than the sum of its proper divisors (495607034).

990815902 is a wasteful number, since it uses less digits than its factorization.

990815902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66362.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 990815902 is about 31477.2283087314. The cubic root of 990815902 is about 996.9292139251.

The spelling of 990815902 in words is "nine hundred ninety million, eight hundred fifteen thousand, nine hundred two".