139172518 has 8 divisors (see below), whose sum is σ = 209048112. Its totient is φ = 69489816.

The previous prime is 139172513. The next prime is 139172519. The reversal of 139172518 is 815271931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139172513) 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, 46405 + ... + 49312.

It is an arithmetic number, because the mean of its divisors is an integer number (26131014).

Almost surely, 2^139172518 is an apocalyptic number.

139172518 is a deficient number, since it is larger than the sum of its proper divisors (69875594).

139172518 is an equidigital number, since it uses as much as digits as its factorization.

139172518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96446.

The product of its digits is 15120, while the sum is 37.

The square root of 139172518 is about 11797.1402466869. The cubic root of 139172518 is about 518.2243652707.

The spelling of 139172518 in words is "one hundred thirty-nine million, one hundred seventy-two thousand, five hundred eighteen".