139139392 has 56 divisors (see below), whose sum is σ = 317991744. Its totient is φ = 59169792.

The previous prime is 139139389. The next prime is 139139393. The reversal of 139139392 is 293931931.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×139139392² = 38719540812259328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139139393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60243 + ... + 62509.

It is an arithmetic number, because the mean of its divisors is an integer number (5678424).

Almost surely, 2^139139392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139139392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158995872).

139139392 is an abundant number, since it is smaller than the sum of its proper divisors (178852352).

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

139139392 is a wasteful number, since it uses less digits than its factorization.

139139392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423 (or 2413 counting only the distinct ones).

The product of its digits is 39366, while the sum is 40.

The square root of 139139392 is about 11795.7361788063. The cubic root of 139139392 is about 518.1832458918.

The spelling of 139139392 in words is "one hundred thirty-nine million, one hundred thirty-nine thousand, three hundred ninety-two".