1639868307 has 64 divisors (see below), whose sum is σ = 2866959360. Its totient is φ = 808819200.

The previous prime is 1639868303. The next prime is 1639868309. The reversal of 1639868307 is 7038689361.

It is not a de Polignac number, because 1639868307 - 2² = 1639868303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1639868307.

It is not an unprimeable number, because it can be changed into a prime (1639868303) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 406633 + ... + 410645.

It is an arithmetic number, because the mean of its divisors is an integer number (44796240).

Almost surely, 2^1639868307 is an apocalyptic number.

1639868307 is a deficient number, since it is larger than the sum of its proper divisors (1227091053).

1639868307 is a wasteful number, since it uses less digits than its factorization.

1639868307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124.

The product of its (nonzero) digits is 1306368, while the sum is 51.

The square root of 1639868307 is about 40495.2874665683. The cubic root of 1639868307 is about 1179.2421416832.

The spelling of 1639868307 in words is "one billion, six hundred thirty-nine million, eight hundred sixty-eight thousand, three hundred seven".