139708523 has 4 divisors (see below), whose sum is σ = 139989000. Its totient is φ = 139428048.

The previous prime is 139708511. The next prime is 139708529. The reversal of 139708523 is 325807931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139708523 - 2⁴ = 139708507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139708529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139490 + ... + 140487.

It is an arithmetic number, because the mean of its divisors is an integer number (34997250).

Almost surely, 2^139708523 is an apocalyptic number.

139708523 is a deficient number, since it is larger than the sum of its proper divisors (280477).

139708523 is an equidigital number, since it uses as much as digits as its factorization.

139708523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280476.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 139708523 is about 11819.8359971702. The cubic root of 139708523 is about 518.8888044296. Note that the first 4 decimals are identical.

The spelling of 139708523 in words is "one hundred thirty-nine million, seven hundred eight thousand, five hundred twenty-three".