404240520 has 64 divisors (see below), whose sum is σ = 1217643840. Its totient is φ = 107360000.

The previous prime is 404240509. The next prime is 404240539. The reversal of 404240520 is 25042404.

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, 23410 + ... + 36830.

It is an arithmetic number, because the mean of its divisors is an integer number (19025685).

Almost surely, 2^404240520 is an apocalyptic number.

404240520 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 404240520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (608821920).

404240520 is an abundant number, since it is smaller than the sum of its proper divisors (813403320).

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

404240520 is a wasteful number, since it uses less digits than its factorization.

404240520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13686 (or 13682 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 404240520 is about 20105.7335106183. The cubic root of 404240520 is about 739.4008542057.

Adding to 404240520 its reverse (25042404), we get a palindrome (429282924).

The spelling of 404240520 in words is "four hundred four million, two hundred forty thousand, five hundred twenty".