639459963 has 12 divisors (see below), whose sum is σ = 925727400. Its totient is φ = 425354496.

The previous prime is 639459959. The next prime is 639459973. The reversal of 639459963 is 369954936.

It is not a de Polignac number, because 639459963 - 2² = 639459959 is a prime.

It is a super-2 number, since 2×639459963² = 817818088559922738, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639459943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75081 + ... + 83162.

It is an arithmetic number, because the mean of its divisors is an integer number (77143950).

Almost surely, 2^639459963 is an apocalyptic number.

639459963 is a deficient number, since it is larger than the sum of its proper divisors (286267437).

639459963 is a wasteful number, since it uses less digits than its factorization.

639459963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158698 (or 158695 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 54.

The square root of 639459963 is about 25287.5456104384. The cubic root of 639459963 is about 861.5314172940.

The spelling of 639459963 in words is "six hundred thirty-nine million, four hundred fifty-nine thousand, nine hundred sixty-three".