37221540 has 24 divisors (see below), whose sum is σ = 104220480. Its totient is φ = 9925728.

The previous prime is 37221533. The next prime is 37221581. The reversal of 37221540 is 4512273.

It is a self number, because there is not a number n which added to its sum of digits gives 37221540.

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, 310120 + ... + 310239.

It is an arithmetic number, because the mean of its divisors is an integer number (4342520).

Almost surely, 2^37221540 is an apocalyptic number.

37221540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

37221540 is an abundant number, since it is smaller than the sum of its proper divisors (66998940).

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

37221540 is a wasteful number, since it uses less digits than its factorization.

37221540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620371 (or 620369 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 37221540 is about 6100.9458283122. The cubic root of 37221540 is about 333.8859256412.

It can be divided in two parts, 372 and 21540, that added together give a palindrome (21912).

The spelling of 37221540 in words is "thirty-seven million, two hundred twenty-one thousand, five hundred forty".