404887720 has 64 divisors (see below), whose sum is σ = 963648000. Its totient is φ = 152679168.

The previous prime is 404887709. The next prime is 404887727. The reversal of 404887720 is 27788404.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (404887727) 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, 168286 + ... + 170674.

It is an arithmetic number, because the mean of its divisors is an integer number (15057000).

Almost surely, 2^404887720 is an apocalyptic number.

404887720 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 404887720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481824000).

404887720 is an abundant number, since it is smaller than the sum of its proper divisors (558760280).

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

404887720 is a wasteful number, since it uses less digits than its factorization.

404887720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642 (or 2638 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 404887720 is about 20121.8219850987. The cubic root of 404887720 is about 739.7952440559.

The spelling of 404887720 in words is "four hundred four million, eight hundred eighty-seven thousand, seven hundred twenty".