139209939 has 12 divisors (see below), whose sum is σ = 219361272. Its totient is φ = 84369600.

The previous prime is 139209919. The next prime is 139209943. The reversal of 139209939 is 939902931.

It is not a de Polignac number, because 139209939 - 2⁸ = 139209683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139209894 and 139209903.

It is not an unprimeable number, because it can be changed into a prime (139209919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 702982 + ... + 703179.

It is an arithmetic number, because the mean of its divisors is an integer number (18280106).

Almost surely, 2^139209939 is an apocalyptic number.

139209939 is a deficient number, since it is larger than the sum of its proper divisors (80151333).

139209939 is a wasteful number, since it uses less digits than its factorization.

139209939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406178 (or 1406175 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 139209939 is about 11798.7261600564. The cubic root of 139209939 is about 518.2708081950.

It can be divided in two parts, 1 and 39209939, that added together give a triangular number (39209940 = T₈₈₅₅).

The spelling of 139209939 in words is "one hundred thirty-nine million, two hundred nine thousand, nine hundred thirty-nine".