404581944 has 64 divisors (see below), whose sum is σ = 1095847200. Its totient is φ = 124470528.

The previous prime is 404581943. The next prime is 404581967. The reversal of 404581944 is 449185404.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404581943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48892 + ... + 56564.

Almost surely, 2^404581944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404581944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (547923600).

404581944 is an abundant number, since it is smaller than the sum of its proper divisors (691265256).

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

404581944 is a wasteful number, since it uses less digits than its factorization.

404581944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7721 (or 7691 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 404581944 is about 20114.2224309069. Note that the first 3 decimals coincide. The cubic root of 404581944 is about 739.6089631117.

The spelling of 404581944 in words is "four hundred four million, five hundred eighty-one thousand, nine hundred forty-four".