139872668 has 24 divisors (see below), whose sum is σ = 279114192. Its totient is φ = 60758784.

The previous prime is 139872653. The next prime is 139872673. The reversal of 139872668 is 866278931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78230 + ... + 79997.

It is an arithmetic number, because the mean of its divisors is an integer number (11629758).

Almost surely, 2^139872668 is an apocalyptic number.

It is an amenable number.

139872668 is a deficient number, since it is larger than the sum of its proper divisors (139241524).

139872668 is a wasteful number, since it uses less digits than its factorization.

139872668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158261 (or 158259 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

The square root of 139872668 is about 11826.7775830951. Note that the first 3 decimals coincide. The cubic root of 139872668 is about 519.0919408498.

The spelling of 139872668 in words is "one hundred thirty-nine million, eight hundred seventy-two thousand, six hundred sixty-eight".