38731992 has 64 divisors (see below), whose sum is σ = 106740480. Its totient is φ = 11636352.

The previous prime is 38731981. The next prime is 38731997. The reversal of 38731992 is 29913783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38731997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11973 + ... + 14859.

It is an arithmetic number, because the mean of its divisors is an integer number (1667820).

Almost surely, 2^38731992 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 38731992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53370240).

38731992 is an abundant number, since it is smaller than the sum of its proper divisors (68008488).

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

38731992 is a wasteful number, since it uses less digits than its factorization.

38731992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952 (or 2948 counting only the distinct ones).

The product of its digits is 81648, while the sum is 42.

The square root of 38731992 is about 6223.5031935398. The cubic root of 38731992 is about 338.3425445547.

The spelling of 38731992 in words is "thirty-eight million, seven hundred thirty-one thousand, nine hundred ninety-two".