38990440 has 16 divisors (see below), whose sum is σ = 87728580. Its totient is φ = 15596160.

The previous prime is 38990429. The next prime is 38990443. The reversal of 38990440 is 4409983.

It can be written as a sum of positive squares in 2 ways, for example, as 33709636 + 5280804 = 5806^2 + 2298^2 .

It is a super-2 number, since 2×38990440² = 3040508822787200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38990440.

It is not an unprimeable number, because it can be changed into a prime (38990443) 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, 487341 + ... + 487420.

Almost surely, 2^38990440 is an apocalyptic number.

It is an amenable number.

38990440 is an abundant number, since it is smaller than the sum of its proper divisors (48738140).

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

38990440 is a wasteful number, since it uses less digits than its factorization.

38990440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974772 (or 974768 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 38990440 is about 6244.2325389114. The cubic root of 38990440 is about 339.0934326512.

The spelling of 38990440 in words is "thirty-eight million, nine hundred ninety thousand, four hundred forty".