139518693 has 24 divisors (see below), whose sum is σ = 215744256. Its totient is φ = 90007200.

The previous prime is 139518679. The next prime is 139518697. The reversal of 139518693 is 396815931.

It is not a de Polignac number, because 139518693 - 2²¹ = 137421541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139518697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1728 + ... + 16793.

It is an arithmetic number, because the mean of its divisors is an integer number (8989344).

Almost surely, 2^139518693 is an apocalyptic number.

It is an amenable number.

139518693 is a deficient number, since it is larger than the sum of its proper divisors (76225563).

139518693 is an equidigital number, since it uses as much as digits as its factorization.

139518693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18567 (or 18555 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 139518693 is about 11811.8031223010. The cubic root of 139518693 is about 518.6536832259.

The spelling of 139518693 in words is "one hundred thirty-nine million, five hundred eighteen thousand, six hundred ninety-three".