139631688 has 192 divisors, whose sum is σ = 464056320. Its totient is φ = 38491200.

The previous prime is 139631669. The next prime is 139631717. The reversal of 139631688 is 886136931.

It is a happy number.

139631688 is a `hidden beast` number, since 1 + 3 + 9 + 631 + 6 + 8 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 421683 + ... + 422013.

It is an arithmetic number, because the mean of its divisors is an integer number (2416960).

Almost surely, 2^139631688 is an apocalyptic number.

139631688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139631688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232028160).

139631688 is an abundant number, since it is smaller than the sum of its proper divisors (324424632).

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

139631688 is a wasteful number, since it uses less digits than its factorization.

139631688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 374 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 139631688 is about 11816.5852935609. The cubic root of 139631688 is about 518.7936631753.

It can be divided in two parts, 13963 and 1688, that added together give a palindrome (15651).

The spelling of 139631688 in words is "one hundred thirty-nine million, six hundred thirty-one thousand, six hundred eighty-eight".