38431900 has 144 divisors (see below), whose sum is σ = 99743616. Its totient is φ = 12718080.

The previous prime is 38431879. The next prime is 38431901. The reversal of 38431900 is 913483.

It is a super-2 number, since 2×38431900² = 2954021875220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38431901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 817677 + ... + 817723.

It is an arithmetic number, because the mean of its divisors is an integer number (692664).

Almost surely, 2^38431900 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 38431900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49871808).

38431900 is an abundant number, since it is smaller than the sum of its proper divisors (61311716).

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

38431900 is a wasteful number, since it uses less digits than its factorization.

38431900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 38431900 is about 6199.3467397783. The cubic root of 38431900 is about 337.4664621452.

The spelling of 38431900 in words is "thirty-eight million, four hundred thirty-one thousand, nine hundred".