639206337 has 48 divisors (see below), whose sum is σ = 1081092096. Its totient is φ = 328812000.

The previous prime is 639206297. The next prime is 639206369. The reversal of 639206337 is 733602936.

It is not a de Polignac number, because 639206337 - 2⁷ = 639206209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 639206295 and 639206304.

It is not an unprimeable number, because it can be changed into a prime (639206377) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 270712 + ... + 273062.

It is an arithmetic number, because the mean of its divisors is an integer number (22522752).

Almost surely, 2^639206337 is an apocalyptic number.

It is an amenable number.

639206337 is a deficient number, since it is larger than the sum of its proper divisors (441885759).

639206337 is a wasteful number, since it uses less digits than its factorization.

639206337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490 (or 2479 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 39.

The square root of 639206337 is about 25282.5302728979. The cubic root of 639206337 is about 861.4175005129.

It can be divided in two parts, 6392063 and 37, that added together give a triangular number (6392100 = T₃₅₇₅).

The spelling of 639206337 in words is "six hundred thirty-nine million, two hundred six thousand, three hundred thirty-seven".