139187808 has 60 divisors (see below), whose sum is σ = 409355100. Its totient is φ = 46395072.

The previous prime is 139187801. The next prime is 139187813. The reversal of 139187808 is 808781931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139187801) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24258 + ... + 29441.

It is an arithmetic number, because the mean of its divisors is an integer number (6822585).

Almost surely, 2^139187808 is an apocalyptic number.

139187808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139187808 is an abundant number, since it is smaller than the sum of its proper divisors (270167292).

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

139187808 is an equidigital number, since it uses as much as digits as its factorization.

139187808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53721 (or 53704 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 139187808 is about 11797.7882672982. The cubic root of 139187808 is about 518.2433425815.

The spelling of 139187808 in words is "one hundred thirty-nine million, one hundred eighty-seven thousand, eight hundred eight".