38521940 has 12 divisors (see below), whose sum is σ = 80896116. Its totient is φ = 15408768.

The previous prime is 38521913. The next prime is 38521943. The reversal of 38521940 is 4912583.

It can be written as a sum of positive squares in 2 ways, for example, as 7474756 + 31047184 = 2734^2 + 5572^2 .

It is a super-2 number, since 2×38521940² = 2967879722727200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 38521897 and 38521906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38521943) 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, 963029 + ... + 963068.

It is an arithmetic number, because the mean of its divisors is an integer number (6741343).

Almost surely, 2^38521940 is an apocalyptic number.

It is an amenable number.

38521940 is an abundant number, since it is smaller than the sum of its proper divisors (42374176).

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

38521940 is a wasteful number, since it uses less digits than its factorization.

38521940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926106 (or 1926104 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 38521940 is about 6206.6045467711. The cubic root of 38521940 is about 337.7298005143.

The spelling of 38521940 in words is "thirty-eight million, five hundred twenty-one thousand, nine hundred forty".