639600139 has 2 divisors, whose sum is σ = 639600140. Its totient is φ = 639600138.

The previous prime is 639600127. The next prime is 639600151. The reversal of 639600139 is 931006936.

It is a balanced prime because it is at equal distance from previous prime (639600127) and next prime (639600151).

It is a cyclic number.

It is not a de Polignac number, because 639600139 - 2⁵ = 639600107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 639600098 and 639600107.

It is not a weakly prime, because it can be changed into another prime (639600109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319800069 + 319800070.

It is an arithmetic number, because the mean of its divisors is an integer number (319800070).

Almost surely, 2^639600139 is an apocalyptic number.

639600139 is a deficient number, since it is larger than the sum of its proper divisors (1).

639600139 is an equidigital number, since it uses as much as digits as its factorization.

639600139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 639600139 is about 25290.3170996332. The cubic root of 639600139 is about 861.5943647871.

The spelling of 639600139 in words is "six hundred thirty-nine million, six hundred thousand, one hundred thirty-nine".