139209507 has 6 divisors (see below), whose sum is σ = 201080412. Its totient is φ = 92806332.

The previous prime is 139209493. The next prime is 139209517. The reversal of 139209507 is 705902931.

It is not a de Polignac number, because 139209507 - 2⁴ = 139209491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139209517) 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 5 ways as a sum of consecutive naturals, for example, 7733853 + ... + 7733870.

It is an arithmetic number, because the mean of its divisors is an integer number (33513402).

Almost surely, 2^139209507 is an apocalyptic number.

139209507 is a deficient number, since it is larger than the sum of its proper divisors (61870905).

139209507 is a wasteful number, since it uses less digits than its factorization.

139209507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15467729 (or 15467726 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 139209507 is about 11798.7078529812. The cubic root of 139209507 is about 518.2702720905.

The spelling of 139209507 in words is "one hundred thirty-nine million, two hundred nine thousand, five hundred seven".