139217679 has 6 divisors (see below), whose sum is σ = 201092216. Its totient is φ = 92811780.

The previous prime is 139217669. The next prime is 139217681. The reversal of 139217679 is 976712931.

It is not a de Polignac number, because 139217679 - 2⁵ = 139217647 is a prime.

It is a super-2 number, since 2×139217679² = 38763124292294082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139217609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7734307 + ... + 7734324.

Almost surely, 2^139217679 is an apocalyptic number.

139217679 is a deficient number, since it is larger than the sum of its proper divisors (61874537).

139217679 is a wasteful number, since it uses less digits than its factorization.

139217679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15468637 (or 15468634 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 139217679 is about 11799.0541570077. The cubic root of 139217679 is about 518.2804132125.

The spelling of 139217679 in words is "one hundred thirty-nine million, two hundred seventeen thousand, six hundred seventy-nine".