139388865 has 128 divisors (see below), whose sum is σ = 305233920. Its totient is φ = 52531200.

The previous prime is 139388849. The next prime is 139388867. The reversal of 139388865 is 568883931.

139388865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139388865 - 2⁴ = 139388849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (139388867) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 608571 + ... + 608799.

It is an arithmetic number, because the mean of its divisors is an integer number (2384640).

Almost surely, 2^139388865 is an apocalyptic number.

139388865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139388865 is an abundant number, since it is smaller than the sum of its proper divisors (165845055).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139388865 is a wasteful number, since it uses less digits than its factorization.

139388865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303.

The product of its digits is 1244160, while the sum is 51.

The square root of 139388865 is about 11806.3061539162. The cubic root of 139388865 is about 518.4927569586.

The spelling of 139388865 in words is "one hundred thirty-nine million, three hundred eighty-eight thousand, eight hundred sixty-five".