139542939 has 16 divisors (see below), whose sum is σ = 208865440. Its totient is φ = 92067840.

The previous prime is 139542911. The next prime is 139542971. The reversal of 139542939 is 939245931.

139542939 is a `hidden beast` number, since 13 + 9 + 542 + 93 + 9 = 666.

It is not a de Polignac number, because 139542939 - 2⁹ = 139542427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139542894 and 139542903.

It is not an unprimeable number, because it can be changed into a prime (139542539) 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 15 ways as a sum of consecutive naturals, for example, 24022 + ... + 29259.

It is an arithmetic number, because the mean of its divisors is an integer number (13054090).

Almost surely, 2^139542939 is an apocalyptic number.

139542939 is a deficient number, since it is larger than the sum of its proper divisors (69322501).

139542939 is an equidigital number, since it uses as much as digits as its factorization.

139542939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53387 (or 53381 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 139542939 is about 11812.8294239780. The cubic root of 139542939 is about 518.6837259118.

The spelling of 139542939 in words is "one hundred thirty-nine million, five hundred forty-two thousand, nine hundred thirty-nine".