40011220 has 24 divisors (see below), whose sum is σ = 84181608. Its totient is φ = 15974400.

The previous prime is 40011211. The next prime is 40011233. The reversal of 40011220 is 2211004.

It can be written as a sum of positive squares in 4 ways, for example, as 1223236 + 38787984 = 1106^2 + 6228^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 40011197 and 40011206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11260 + ... + 14380.

It is an arithmetic number, because the mean of its divisors is an integer number (3507567).

Almost surely, 2^40011220 is an apocalyptic number.

It is an amenable number.

40011220 is an abundant number, since it is smaller than the sum of its proper divisors (44170388).

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

40011220 is a wasteful number, since it uses less digits than its factorization.

40011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3771 (or 3769 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 40011220 is about 6325.4422770270. The cubic root of 40011220 is about 342.0271628962.

Adding to 40011220 its reverse (2211004), we get a palindrome (42222224).

The spelling of 40011220 in words is "forty million, eleven thousand, two hundred twenty".