139215986 has 32 divisors (see below), whose sum is σ = 257644800. Its totient is φ = 54939456.

The previous prime is 139215977. The next prime is 139216031. The reversal of 139215986 is 689512931.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108380 + ... + 109656.

It is an arithmetic number, because the mean of its divisors is an integer number (8051400).

Almost surely, 2^139215986 is an apocalyptic number.

139215986 is a deficient number, since it is larger than the sum of its proper divisors (118428814).

139215986 is a wasteful number, since it uses less digits than its factorization.

139215986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898.

The product of its digits is 116640, while the sum is 44.

The square root of 139215986 is about 11798.9824137508. The cubic root of 139215986 is about 518.2783123005.

The spelling of 139215986 in words is "one hundred thirty-nine million, two hundred fifteen thousand, nine hundred eighty-six".