639565041 has 8 divisors (see below), whose sum is σ = 902915424. Its totient is φ = 401295680.

The previous prime is 639564983. The next prime is 639565051. The reversal of 639565041 is 140565936.

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

It is a cyclic number.

It is not a de Polignac number, because 639565041 - 2⁶ = 639564977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639565051) 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, 6270195 + ... + 6270296.

It is an arithmetic number, because the mean of its divisors is an integer number (112864428).

Almost surely, 2^639565041 is an apocalyptic number.

It is an amenable number.

639565041 is a deficient number, since it is larger than the sum of its proper divisors (263350383).

639565041 is a wasteful number, since it uses less digits than its factorization.

639565041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12540511.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 639565041 is about 25289.6231881774. The cubic root of 639565041 is about 861.5786045277.

The spelling of 639565041 in words is "six hundred thirty-nine million, five hundred sixty-five thousand, forty-one".