139164239 has 4 divisors (see below), whose sum is σ = 143653440. Its totient is φ = 134675040.

The previous prime is 139164229. The next prime is 139164257. The reversal of 139164239 is 932461931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932461931 = 4603 ⋅202577.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139164239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139164229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2244554 + ... + 2244615.

It is an arithmetic number, because the mean of its divisors is an integer number (35913360).

Almost surely, 2^139164239 is an apocalyptic number.

139164239 is a deficient number, since it is larger than the sum of its proper divisors (4489201).

139164239 is an equidigital number, since it uses as much as digits as its factorization.

139164239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489200.

The product of its digits is 34992, while the sum is 38.

The square root of 139164239 is about 11796.7893513447. The cubic root of 139164239 is about 518.2140891409.

The spelling of 139164239 in words is "one hundred thirty-nine million, one hundred sixty-four thousand, two hundred thirty-nine".