639698492 has 12 divisors (see below), whose sum is σ = 1128288000. Its totient is φ = 317330496.

The previous prime is 639698461. The next prime is 639698509. The reversal of 639698492 is 294896936.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629117 + ... + 630132.

It is an arithmetic number, because the mean of its divisors is an integer number (94024000).

Almost surely, 2^639698492 is an apocalyptic number.

It is an amenable number.

639698492 is a deficient number, since it is larger than the sum of its proper divisors (488589508).

639698492 is a wasteful number, since it uses less digits than its factorization.

639698492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259380 (or 1259378 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 56.

The square root of 639698492 is about 25292.2615042625. The cubic root of 639698492 is about 861.6385257360.

The spelling of 639698492 in words is "six hundred thirty-nine million, six hundred ninety-eight thousand, four hundred ninety-two".