139523139 has 24 divisors (see below), whose sum is σ = 235029600. Its totient is φ = 79725744.

The previous prime is 139523081. The next prime is 139523149. The reversal of 139523139 is 931325931.

139523139 is a `hidden beast` number, since 1 + 395 + 231 + 39 = 666.

It is not a de Polignac number, because 139523139 - 2⁸ = 139522883 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (139523149) 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 23 ways as a sum of consecutive naturals, for example, 19512 + ... + 25685.

It is an arithmetic number, because the mean of its divisors is an integer number (9792900).

Almost surely, 2^139523139 is an apocalyptic number.

139523139 is a deficient number, since it is larger than the sum of its proper divisors (95506461).

139523139 is an equidigital number, since it uses as much as digits as its factorization.

139523139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45224 (or 45207 counting only the distinct ones).

The product of its digits is 21870, while the sum is 36.

The square root of 139523139 is about 11811.9913223808. The cubic root of 139523139 is about 518.6591924274.

The spelling of 139523139 in words is "one hundred thirty-nine million, five hundred twenty-three thousand, one hundred thirty-nine".