139218125 has 20 divisors (see below), whose sum is σ = 179989260. Its totient is φ = 107520000.

The previous prime is 139218061. The next prime is 139218143. The reversal of 139218125 is 521812931.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 92582884 + 46635241 = 9622^2 + 6829^2 .

It is not a de Polignac number, because 139218125 - 2⁶ = 139218061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139218091 and 139218100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 14285 + ... + 21965.

It is an arithmetic number, because the mean of its divisors is an integer number (8999463).

Almost surely, 2^139218125 is an apocalyptic number.

It is an amenable number.

139218125 is a deficient number, since it is larger than the sum of its proper divisors (40771135).

139218125 is an frugal number, since it uses more digits than its factorization.

139218125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7730 (or 7715 counting only the distinct ones).

The product of its digits is 4320, while the sum is 32.

The square root of 139218125 is about 11799.0730568126. The cubic root of 139218125 is about 518.2809666691.

The spelling of 139218125 in words is "one hundred thirty-nine million, two hundred eighteen thousand, one hundred twenty-five".