139731768 has 144 divisors (see below), whose sum is σ = 426786360. Its totient is φ = 41247360.

The previous prime is 139731751. The next prime is 139731769. The reversal of 139731768 is 867137931.

Its product of digits (190512) is a multiple of the sum of its prime divisors (432).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139731769) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 374430 + ... + 374802.

Almost surely, 2^139731768 is an apocalyptic number.

139731768 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 139731768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213393180).

139731768 is an abundant number, since it is smaller than the sum of its proper divisors (287054592).

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

139731768 is a wasteful number, since it uses less digits than its factorization.

139731768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 432 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 139731768 is about 11820.8192609480. The cubic root of 139731768 is about 518.9175807732.

The spelling of 139731768 in words is "one hundred thirty-nine million, seven hundred thirty-one thousand, seven hundred sixty-eight".