139434939 has 90 divisors (see below), whose sum is σ = 261120420. Its totient is φ = 73728144.

The previous prime is 139434917. The next prime is 139434941. The reversal of 139434939 is 939434931.

It is not a de Polignac number, because 139434939 - 2²⁰ = 138386363 is a prime.

Its product of digits (314928) is a multiple of the sum of its prime divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 139434894 and 139434903.

It is not an unprimeable number, because it can be changed into a prime (139432939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 3242652 + ... + 3242694.

It is an arithmetic number, because the mean of its divisors is an integer number (2901338).

Almost surely, 2^139434939 is an apocalyptic number.

139434939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

139434939 is a deficient number, since it is larger than the sum of its proper divisors (121685481).

139434939 is an equidigital number, since it uses as much as digits as its factorization.

139434939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 72 counting only the distinct ones).

The product of its digits is 314928, while the sum is 45.

The square root of 139434939 is about 11808.2572380517. The cubic root of 139434939 is about 518.5498786990.

The spelling of 139434939 in words is "one hundred thirty-nine million, four hundred thirty-four thousand, nine hundred thirty-nine".