139338428 has 24 divisors (see below), whose sum is σ = 252887040. Its totient is φ = 67106160.

The previous prime is 139338413. The next prime is 139338449. The reversal of 139338428 is 824833931.

It is a super-2 number, since 2×139338428² = 38830395035022368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25133 + ... + 30171.

It is an arithmetic number, because the mean of its divisors is an integer number (10536960).

Almost surely, 2^139338428 is an apocalyptic number.

It is an amenable number.

139338428 is a deficient number, since it is larger than the sum of its proper divisors (113548612).

139338428 is a wasteful number, since it uses less digits than its factorization.

139338428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297 (or 5295 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 139338428 is about 11804.1699411691. The cubic root of 139338428 is about 518.4302116134.

The spelling of 139338428 in words is "one hundred thirty-nine million, three hundred thirty-eight thousand, four hundred twenty-eight".