139888807 has 2 divisors, whose sum is σ = 139888808. Its totient is φ = 139888806.

The previous prime is 139888787. The next prime is 139888813. The reversal of 139888807 is 708888931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139888807 - 2²³ = 131500199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139888817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69944403 + 69944404.

It is an arithmetic number, because the mean of its divisors is an integer number (69944404).

Almost surely, 2^139888807 is an apocalyptic number.

139888807 is a deficient number, since it is larger than the sum of its proper divisors (1).

139888807 is an equidigital number, since it uses as much as digits as its factorization.

139888807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 52.

The square root of 139888807 is about 11827.4598709951. The cubic root of 139888807 is about 519.1119049661. Note that the first 3 decimals are identical.

The spelling of 139888807 in words is "one hundred thirty-nine million, eight hundred eighty-eight thousand, eight hundred seven".