40404440 has 32 divisors (see below), whose sum is σ = 91482480. Its totient is φ = 16060032.

The previous prime is 40404433. The next prime is 40404457. The reversal of 40404440 is 4440404.

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

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, 3422 + ... + 9618.

Almost surely, 2^40404440 is an apocalyptic number.

40404440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40404440 is an abundant number, since it is smaller than the sum of its proper divisors (51078040).

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

40404440 is a wasteful number, since it uses less digits than its factorization.

40404440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6371 (or 6367 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 40404440 is about 6356.4486940429. The cubic root of 40404440 is about 343.1439640239.

Adding to 40404440 its reverse (4440404), we get a palindrome (44844844).

The spelling of 40404440 in words is "forty million, four hundred four thousand, four hundred forty".