1638012965 has 16 divisors (see below), whose sum is σ = 2089784448. Its totient is φ = 1229781696.

The previous prime is 1638012947. The next prime is 1638012973. The reversal of 1638012965 is 5692108361.

1638012965 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1638012965 - 2⁸ = 1638012709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128279 + ... + 140468.

It is an arithmetic number, because the mean of its divisors is an integer number (130611528).

Almost surely, 2^1638012965 is an apocalyptic number.

It is an amenable number.

1638012965 is a deficient number, since it is larger than the sum of its proper divisors (451771483).

1638012965 is a wasteful number, since it uses less digits than its factorization.

1638012965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268828.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1638012965 is about 40472.3728610024. The cubic root of 1638012965 is about 1178.7972435349.

The spelling of 1638012965 in words is "one billion, six hundred thirty-eight million, twelve thousand, nine hundred sixty-five".