1639690492 has 24 divisors (see below), whose sum is σ = 3181640112. Its totient is φ = 733094400.

The previous prime is 1639690487. The next prime is 1639690499. The reversal of 1639690492 is 2940969361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639690499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302773 + ... + 308140.

It is an arithmetic number, because the mean of its divisors is an integer number (132568338).

Almost surely, 2^1639690492 is an apocalyptic number.

It is an amenable number.

1639690492 is a deficient number, since it is larger than the sum of its proper divisors (1541949620).

1639690492 is a wasteful number, since it uses less digits than its factorization.

1639690492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610989 (or 610987 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 1639690492 is about 40493.0919046694. The cubic root of 1639690492 is about 1179.1995174229.

The spelling of 1639690492 in words is "one billion, six hundred thirty-nine million, six hundred ninety thousand, four hundred ninety-two".