139694988 has 12 divisors (see below), whose sum is σ = 325955000. Its totient is φ = 46564992.

The previous prime is 139694987. The next prime is 139694993. The reversal of 139694988 is 889496931.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (139694983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5820613 + ... + 5820636.

Almost surely, 2^139694988 is an apocalyptic number.

It is an amenable number.

139694988 is an abundant number, since it is smaller than the sum of its proper divisors (186260012).

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

139694988 is a wasteful number, since it uses less digits than its factorization.

139694988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11641256 (or 11641254 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 57.

The square root of 139694988 is about 11819.2634288267. The cubic root of 139694988 is about 518.8720471920.

The spelling of 139694988 in words is "one hundred thirty-nine million, six hundred ninety-four thousand, nine hundred eighty-eight".