139864647 has 16 divisors (see below), whose sum is σ = 201277440. Its totient is φ = 85879392.

The previous prime is 139864631. The next prime is 139864663. The reversal of 139864647 is 746468931.

It is an interprime number because it is at equal distance from previous prime (139864631) and next prime (139864663).

It is not a de Polignac number, because 139864647 - 2⁴ = 139864631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 139864596 and 139864605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139864147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14938 + ... + 22424.

It is an arithmetic number, because the mean of its divisors is an integer number (12579840).

Almost surely, 2^139864647 is an apocalyptic number.

139864647 is a deficient number, since it is larger than the sum of its proper divisors (61412793).

139864647 is a wasteful number, since it uses less digits than its factorization.

139864647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7982.

The product of its digits is 870912, while the sum is 48.

The square root of 139864647 is about 11826.4384748748. The cubic root of 139864647 is about 519.0820182154.

The spelling of 139864647 in words is "one hundred thirty-nine million, eight hundred sixty-four thousand, six hundred forty-seven".