639444027 has 16 divisors (see below), whose sum is σ = 880554240. Its totient is φ = 412444512.

The previous prime is 639444007. The next prime is 639444083. The reversal of 639444027 is 720444936.

It is not a de Polignac number, because 639444027 - 2⁸ = 639443771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639444007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3778 + ... + 35960.

It is an arithmetic number, because the mean of its divisors is an integer number (55034640).

Almost surely, 2^639444027 is an apocalyptic number.

639444027 is a deficient number, since it is larger than the sum of its proper divisors (241110213).

639444027 is a wasteful number, since it uses less digits than its factorization.

639444027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32402.

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 639444027 is about 25287.2305126520. The cubic root of 639444027 is about 861.5242604849.

The spelling of 639444027 in words is "six hundred thirty-nine million, four hundred forty-four thousand, twenty-seven".