139208660 has 12 divisors (see below), whose sum is σ = 292338228. Its totient is φ = 55683456.

The previous prime is 139208651. The next prime is 139208701. The reversal of 139208660 is 66802931.

139208660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 53904964 + 85303696 = 7342^2 + 9236^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139208660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3480197 + ... + 3480236.

It is an arithmetic number, because the mean of its divisors is an integer number (24361519).

Almost surely, 2^139208660 is an apocalyptic number.

139208660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139208660 is an abundant number, since it is smaller than the sum of its proper divisors (153129568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139208660 is a wasteful number, since it uses less digits than its factorization.

139208660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6960442 (or 6960440 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 139208660 is about 11798.6719591656. The cubic root of 139208660 is about 518.2692209750.

The spelling of 139208660 in words is "one hundred thirty-nine million, two hundred eight thousand, six hundred sixty".