404243520 has 112 divisors (see below), whose sum is σ = 1287767808. Its totient is φ = 107438080.

The previous prime is 404243513. The next prime is 404243531. The reversal of 404243520 is 25342404.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413272 + ... + 414248.

Almost surely, 2^404243520 is an apocalyptic number.

404243520 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 404243520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (643883904).

404243520 is an abundant number, since it is smaller than the sum of its proper divisors (883524288).

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

404243520 is a wasteful number, since it uses less digits than its factorization.

404243520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428 (or 1418 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 404243520 is about 20105.8081160644. The cubic root of 404243520 is about 739.4026833123.

Adding to 404243520 its reverse (25342404), we get a palindrome (429585924).

The spelling of 404243520 in words is "four hundred four million, two hundred forty-three thousand, five hundred twenty".