38139392 has 40 divisors (see below), whose sum is σ = 76839576. Its totient is φ = 18911232.

The previous prime is 38139391. The next prime is 38139433. The reversal of 38139392 is 29393183.

It is a super-2 number, since 2×38139392² = 2909226444259328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38139391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83228 + ... + 83684.

Almost surely, 2^38139392 is an apocalyptic number.

38139392 is a gapful number since it is divisible by the number (32) 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 38139392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38419788).

38139392 is an abundant number, since it is smaller than the sum of its proper divisors (38700184).

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

38139392 is an equidigital number, since it uses as much as digits as its factorization.

38139392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 622 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 38139392 is about 6175.7098377434. The cubic root of 38139392 is about 336.6081201769.

The spelling of 38139392 in words is "thirty-eight million, one hundred thirty-nine thousand, three hundred ninety-two".