38840400 has 90 divisors (see below), whose sum is σ = 134799470. Its totient is φ = 10356480.

The previous prime is 38840383. The next prime is 38840411. The reversal of 38840400 is 404883.

It can be written as a sum of positive squares in 3 ways, for example, as 1971216 + 36869184 = 1404^2 + 6072^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1795 + ... + 8994.

Almost surely, 2^38840400 is an apocalyptic number.

38840400 is a gapful number since it is divisible by the number (30) 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 38840400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67399735).

38840400 is an abundant number, since it is smaller than the sum of its proper divisors (95959070).

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

38840400 is a wasteful number, since it uses less digits than its factorization.

38840400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10813 (or 10799 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 38840400 is about 6232.2066717977. The cubic root of 38840400 is about 338.6579158119.

The spelling of 38840400 in words is "thirty-eight million, eight hundred forty thousand, four hundred".