40032220 has 12 divisors (see below), whose sum is σ = 84067704. Its totient is φ = 16012880.

The previous prime is 40032211. The next prime is 40032227. The reversal of 40032220 is 2223004.

It is a self number, because there is not a number n which added to its sum of digits gives 40032220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40032227) 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, 1000786 + ... + 1000825.

It is an arithmetic number, because the mean of its divisors is an integer number (7005642).

Almost surely, 2^40032220 is an apocalyptic number.

It is an amenable number.

40032220 is an abundant number, since it is smaller than the sum of its proper divisors (44035484).

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

40032220 is a wasteful number, since it uses less digits than its factorization.

40032220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001620 (or 2001618 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 40032220 is about 6327.1020222532. The cubic root of 40032220 is about 342.0869903995.

Adding to 40032220 its reverse (2223004), we get a palindrome (42255224).

The spelling of 40032220 in words is "forty million, thirty-two thousand, two hundred twenty".