404402240 has 112 divisors (see below), whose sum is σ = 1059753024. Its totient is φ = 145766400.

The previous prime is 404402237. The next prime is 404402263. The reversal of 404402240 is 42204404.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460682 + ... + 461558.

Almost surely, 2^404402240 is an apocalyptic number.

404402240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404402240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (529876512).

404402240 is an abundant number, since it is smaller than the sum of its proper divisors (655350784).

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

404402240 is a wasteful number, since it uses less digits than its factorization.

404402240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036 (or 1026 counting only the distinct ones).

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

The square root of 404402240 is about 20109.7548468399. The cubic root of 404402240 is about 739.4994423464.

Adding to 404402240 its reverse (42204404), we get a palindrome (446606644).

The spelling of 404402240 in words is "four hundred four million, four hundred two thousand, two hundred forty".