1638790194 has 16 divisors (see below), whose sum is σ = 3279091968. Its totient is φ = 546011472.

The previous prime is 1638790189. The next prime is 1638790201. The reversal of 1638790194 is 4910978361.

It is a happy number.

1638790194 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48637 + ... + 75120.

It is an arithmetic number, because the mean of its divisors is an integer number (204943248).

Almost surely, 2^1638790194 is an apocalyptic number.

1638790194 is an abundant number, since it is smaller than the sum of its proper divisors (1640301774).

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

1638790194 is a wasteful number, since it uses less digits than its factorization.

1638790194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125969.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1638790194 is about 40481.9736920027. The cubic root of 1638790194 is about 1178.9836585289.

The spelling of 1638790194 in words is "one billion, six hundred thirty-eight million, seven hundred ninety thousand, one hundred ninety-four".