139539507 has 4 divisors (see below), whose sum is σ = 186052680. Its totient is φ = 93026336.

The previous prime is 139539487. The next prime is 139539509. The reversal of 139539507 is 705935931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139539507 - 2²⁶ = 72430643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139539509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23256582 + ... + 23256587.

It is an arithmetic number, because the mean of its divisors is an integer number (46513170).

Almost surely, 2^139539507 is an apocalyptic number.

139539507 is a deficient number, since it is larger than the sum of its proper divisors (46513173).

139539507 is an equidigital number, since it uses as much as digits as its factorization.

139539507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46513172.

The product of its (nonzero) digits is 127575, while the sum is 42.

The square root of 139539507 is about 11812.6841572946. The cubic root of 139539507 is about 518.6794736075.

The spelling of 139539507 in words is "one hundred thirty-nine million, five hundred thirty-nine thousand, five hundred seven".