404631240 has 64 divisors (see below), whose sum is σ = 1307275200. Its totient is φ = 99601152.

The previous prime is 404631211. The next prime is 404631301. The reversal of 404631240 is 42136404.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 404631240.

It is an unprimeable number.

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, 128130 + ... + 131249.

It is an arithmetic number, because the mean of its divisors is an integer number (20426175).

Almost surely, 2^404631240 is an apocalyptic number.

404631240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404631240 is an abundant number, since it is smaller than the sum of its proper divisors (902643960).

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

404631240 is a wasteful number, since it uses less digits than its factorization.

404631240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259406 (or 259402 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 404631240 is about 20115.4477951648. The cubic root of 404631240 is about 739.6390009349.

Adding to 404631240 its reverse (42136404), we get a palindrome (446767644).

The spelling of 404631240 in words is "four hundred four million, six hundred thirty-one thousand, two hundred forty".