139936807 has 4 divisors (see below), whose sum is σ = 146021040. Its totient is φ = 133852576.

The previous prime is 139936793. The next prime is 139936817. The reversal of 139936807 is 708639931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 708639931 = 139 ⋅5098129.

It is a cyclic number.

It is not a de Polignac number, because 139936807 - 2⁷ = 139936679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139936817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3042082 + ... + 3042127.

It is an arithmetic number, because the mean of its divisors is an integer number (36505260).

Almost surely, 2^139936807 is an apocalyptic number.

139936807 is a deficient number, since it is larger than the sum of its proper divisors (6084233).

139936807 is an equidigital number, since it uses as much as digits as its factorization.

139936807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6084232.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 139936807 is about 11829.4888731509. The cubic root of 139936807 is about 519.1712724084.

The spelling of 139936807 in words is "one hundred thirty-nine million, nine hundred thirty-six thousand, eight hundred seven".