40372220 has 48 divisors (see below), whose sum is σ = 98739648. Its totient is φ = 13578240.

The previous prime is 40372219. The next prime is 40372223. The reversal of 40372220 is 2227304.

It is a happy number.

40372220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40372220² = 3259832295456800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 40372192 and 40372201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40372223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4700 + ... + 10140.

It is an arithmetic number, because the mean of its divisors is an integer number (2057076).

Almost surely, 2^40372220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40372220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49369824).

40372220 is an abundant number, since it is smaller than the sum of its proper divisors (58367428).

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

40372220 is a wasteful number, since it uses less digits than its factorization.

40372220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5510 (or 5508 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 40372220 is about 6353.9137545296. The cubic root of 40372220 is about 343.0527278572.

Adding to 40372220 its reverse (2227304), we get a palindrome (42599524).

The spelling of 40372220 in words is "forty million, three hundred seventy-two thousand, two hundred twenty".