139239828 has 144 divisors (see below), whose sum is σ = 456193920. Its totient is φ = 34774272.

The previous prime is 139239811. The next prime is 139239833. The reversal of 139239828 is 828932931.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 61126 + ... + 63362.

Almost surely, 2^139239828 is an apocalyptic number.

139239828 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 139239828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228096960).

139239828 is an abundant number, since it is smaller than the sum of its proper divisors (316954092).

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

139239828 is a wasteful number, since it uses less digits than its factorization.

139239828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286 (or 2281 counting only the distinct ones).

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

The square root of 139239828 is about 11799.9927118622. The cubic root of 139239828 is about 518.3078972318.

The spelling of 139239828 in words is "one hundred thirty-nine million, two hundred thirty-nine thousand, eight hundred twenty-eight".