404321240 has 32 divisors (see below), whose sum is σ = 910327680. Its totient is φ = 161620992.

The previous prime is 404321233. The next prime is 404321263. The reversal of 404321240 is 42123404.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88697 + ... + 93143.

It is an arithmetic number, because the mean of its divisors is an integer number (28447740).

Almost surely, 2^404321240 is an apocalyptic number.

404321240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404321240 is an abundant number, since it is smaller than the sum of its proper divisors (506006440).

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

404321240 is a wasteful number, since it uses less digits than its factorization.

404321240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6731 (or 6727 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 404321240 is about 20107.7407980111. The cubic root of 404321240 is about 739.4500662150.

Adding to 404321240 its reverse (42123404), we get a palindrome (446444644).

The spelling of 404321240 in words is "four hundred four million, three hundred twenty-one thousand, two hundred forty".