1639811912 has 36 divisors (see below), whose sum is σ = 3127285395. Its totient is φ = 806104368.

The previous prime is 1639811903. The next prime is 1639811941. The reversal of 1639811912 is 2191189361.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 819905956 + 819905956 = 28634^2 + 28634^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=28634.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1639811912.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11797139 + ... + 11797277.

Almost surely, 2^1639811912 is an apocalyptic number.

It is an amenable number.

1639811912 is a deficient number, since it is larger than the sum of its proper divisors (1487473483).

1639811912 is an equidigital number, since it uses as much as digits as its factorization.

1639811912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 244 counting only the distinct ones).

The product of its digits is 23328, while the sum is 41.

The square root of 1639811912 is about 40494.5911449912. The cubic root of 1639811912 is about 1179.2286234995.

Multiplying 1639811912 by its product of digits (23328), we get a square (38253532283136 = 6184944²).

The spelling of 1639811912 in words is "one billion, six hundred thirty-nine million, eight hundred eleven thousand, nine hundred twelve".