639265039 has 8 divisors (see below), whose sum is σ = 731088000. Its totient is φ = 547566936.

The previous prime is 639265037. The next prime is 639265049. The reversal of 639265039 is 930562936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639265039 - 2¹ = 639265037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639264986 and 639265004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639265037) 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, 19969 + ... + 40954.

It is an arithmetic number, because the mean of its divisors is an integer number (91386000).

Almost surely, 2^639265039 is an apocalyptic number.

639265039 is a deficient number, since it is larger than the sum of its proper divisors (91822961).

639265039 is a wasteful number, since it uses less digits than its factorization.

639265039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62429.

The product of its (nonzero) digits is 262440, while the sum is 43.

The square root of 639265039 is about 25283.6911664417. The cubic root of 639265039 is about 861.4438693494.

The spelling of 639265039 in words is "six hundred thirty-nine million, two hundred sixty-five thousand, thirty-nine".