40240440 has 48 divisors (see below), whose sum is σ = 130782600. Its totient is φ = 10730688.

The previous prime is 40240433. The next prime is 40240441. The reversal of 40240440 is 4404204.

It is a happy number.

It is a super-2 number, since 2×40240440² = 3238586022787200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40240441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55530 + ... + 56249.

Almost surely, 2^40240440 is an apocalyptic number.

40240440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40240440 is an abundant number, since it is smaller than the sum of its proper divisors (90542160).

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

40240440 is a wasteful number, since it uses less digits than its factorization.

40240440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111796 (or 111789 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 40240440 is about 6343.5352919330. The cubic root of 40240440 is about 342.6790652619.

Adding to 40240440 its reverse (4404204), we get a palindrome (44644644).

The spelling of 40240440 in words is "forty million, two hundred forty thousand, four hundred forty".