139694986 has 16 divisors (see below), whose sum is σ = 212179968. Its totient is φ = 68972400.

The previous prime is 139694983. The next prime is 139694987. The reversal of 139694986 is 689496931.

It is a super-2 number, since 2×139694986² = 39029378227080392, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 94231 + ... + 95701.

It is an arithmetic number, because the mean of its divisors is an integer number (13261248).

Almost surely, 2^139694986 is an apocalyptic number.

139694986 is a deficient number, since it is larger than the sum of its proper divisors (72484982).

139694986 is a wasteful number, since it uses less digits than its factorization.

139694986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037.

The product of its digits is 2519424, while the sum is 55.

The square root of 139694986 is about 11819.2633442190. The cubic root of 139694986 is about 518.8720447157.

The spelling of 139694986 in words is "one hundred thirty-nine million, six hundred ninety-four thousand, nine hundred eighty-six".