990894639 has 16 divisors (see below), whose sum is σ = 1510403328. Its totient is φ = 566049792.

The previous prime is 990894629. The next prime is 990894647. The reversal of 990894639 is 936498099.

It is not a de Polignac number, because 990894639 - 2⁵ = 990894607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990894629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95599 + ... + 105455.

It is an arithmetic number, because the mean of its divisors is an integer number (94400208).

Almost surely, 2^990894639 is an apocalyptic number.

990894639 is a deficient number, since it is larger than the sum of its proper divisors (519508689).

990894639 is a wasteful number, since it uses less digits than its factorization.

990894639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14654.

The product of its (nonzero) digits is 3779136, while the sum is 57.

The square root of 990894639 is about 31478.4789816789. The cubic root of 990894639 is about 996.9556208275.

The spelling of 990894639 in words is "nine hundred ninety million, eight hundred ninety-four thousand, six hundred thirty-nine".