1639137090 has 64 divisors (see below), whose sum is σ = 4237443072. Its totient is φ = 404606400.

The previous prime is 1639137089. The next prime is 1639137091. The reversal of 1639137090 is 907319361.

It is an interprime number because it is at equal distance from previous prime (1639137089) and next prime (1639137091).

It is not an unprimeable number, because it can be changed into a prime (1639137091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16926 + ... + 59705.

It is an arithmetic number, because the mean of its divisors is an integer number (66210048).

Almost surely, 2^1639137090 is an apocalyptic number.

1639137090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1639137090 is an abundant number, since it is smaller than the sum of its proper divisors (2598305982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1639137090 is a wasteful number, since it uses less digits than its factorization.

1639137090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76695.

The product of its (nonzero) digits is 30618, while the sum is 39.

The square root of 1639137090 is about 40486.2580389939. The cubic root of 1639137090 is about 1179.0668410014.

The spelling of 1639137090 in words is "one billion, six hundred thirty-nine million, one hundred thirty-seven thousand, ninety".