639490196 has 12 divisors (see below), whose sum is σ = 1155208320. Its totient is φ = 309430680.

The previous prime is 639490177. The next prime is 639490199. The reversal of 639490196 is 691094936.

It is a self number, because there is not a number n which added to its sum of digits gives 639490196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639490199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2578466 + ... + 2578713.

It is an arithmetic number, because the mean of its divisors is an integer number (96267360).

Almost surely, 2^639490196 is an apocalyptic number.

It is an amenable number.

639490196 is a deficient number, since it is larger than the sum of its proper divisors (515718124).

639490196 is a wasteful number, since it uses less digits than its factorization.

639490196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5157214 (or 5157212 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 639490196 is about 25288.1433877618. The cubic root of 639490196 is about 861.5449945156.

The spelling of 639490196 in words is "six hundred thirty-nine million, four hundred ninety thousand, one hundred ninety-six".