139660928 has 32 divisors (see below), whose sum is σ = 303527520. Its totient is φ = 63481600.

The previous prime is 139660889. The next prime is 139660943. The reversal of 139660928 is 829066931.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 48188 + ... + 51003.

It is an arithmetic number, because the mean of its divisors is an integer number (9485235).

Almost surely, 2^139660928 is an apocalyptic number.

It is an amenable number.

139660928 is an abundant number, since it is smaller than the sum of its proper divisors (163866592).

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

139660928 is an equidigital number, since it uses as much as digits as its factorization.

139660928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99216 (or 99204 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 139660928 is about 11817.8224728585. The cubic root of 139660928 is about 518.8298738382.

The spelling of 139660928 in words is "one hundred thirty-nine million, six hundred sixty thousand, nine hundred twenty-eight".