639848037 has 4 divisors (see below), whose sum is σ = 853130720. Its totient is φ = 426565356.

The previous prime is 639848021. The next prime is 639848071. The reversal of 639848037 is 730848936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 639848037 - 2⁴ = 639848021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639848087) 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, 106641337 + ... + 106641342.

It is an arithmetic number, because the mean of its divisors is an integer number (213282680).

Almost surely, 2^639848037 is an apocalyptic number.

It is an amenable number.

639848037 is a deficient number, since it is larger than the sum of its proper divisors (213282683).

639848037 is a wasteful number, since it uses less digits than its factorization.

639848037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213282682.

The product of its (nonzero) digits is 870912, while the sum is 48.

The square root of 639848037 is about 25295.2176705400. The cubic root of 639848037 is about 861.7056634555.

The spelling of 639848037 in words is "six hundred thirty-nine million, eight hundred forty-eight thousand, thirty-seven".