139439539 has 2 divisors, whose sum is σ = 139439540. Its totient is φ = 139439538.

The previous prime is 139439513. The next prime is 139439617. The reversal of 139439539 is 935934931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139439539 - 2⁵ = 139439507 is a prime.

It is not a weakly prime, because it can be changed into another prime (139439039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69719769 + 69719770.

It is an arithmetic number, because the mean of its divisors is an integer number (69719770).

Almost surely, 2^139439539 is an apocalyptic number.

139439539 is a deficient number, since it is larger than the sum of its proper divisors (1).

139439539 is an equidigital number, since it uses as much as digits as its factorization.

139439539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 46.

The square root of 139439539 is about 11808.4520153998. The cubic root of 139439539 is about 518.5555810077. Note that the first 4 decimals are identical.

The spelling of 139439539 in words is "one hundred thirty-nine million, four hundred thirty-nine thousand, five hundred thirty-nine".