1638697412 has 24 divisors (see below), whose sum is σ = 3179713152. Its totient is φ = 732650400.

The previous prime is 1638697397. The next prime is 1638697421. The reversal of 1638697412 is 2147968361.

It is an unprimeable number.

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, 302588 + ... + 307955.

It is an arithmetic number, because the mean of its divisors is an integer number (132488048).

Almost surely, 2^1638697412 is an apocalyptic number.

It is an amenable number.

1638697412 is a deficient number, since it is larger than the sum of its proper divisors (1541015740).

1638697412 is a wasteful number, since it uses less digits than its factorization.

1638697412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610619 (or 610617 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 1638697412 is about 40480.8277089291. The cubic root of 1638697412 is about 1178.9614082684.

The spelling of 1638697412 in words is "one billion, six hundred thirty-eight million, six hundred ninety-seven thousand, four hundred twelve".