38815440 has 40 divisors (see below), whose sum is σ = 120328608. Its totient is φ = 10350720.

The previous prime is 38815433. The next prime is 38815453. The reversal of 38815440 is 4451883.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80626 + ... + 81105.

Almost surely, 2^38815440 is an apocalyptic number.

38815440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

38815440 is an abundant number, since it is smaller than the sum of its proper divisors (81513168).

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

38815440 is a wasteful number, since it uses less digits than its factorization.

38815440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161747 (or 161741 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 38815440 is about 6230.2038489924. The cubic root of 38815440 is about 338.5853563728.

The spelling of 38815440 in words is "thirty-eight million, eight hundred fifteen thousand, four hundred forty".