404240728 has 16 divisors (see below), whose sum is σ = 758360880. Its totient is φ = 202011168.

The previous prime is 404240719. The next prime is 404240729. The reversal of 404240728 is 827042404.

It is a self number, because there is not a number n which added to its sum of digits gives 404240728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404240729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3325 + ... + 28627.

It is an arithmetic number, because the mean of its divisors is an integer number (47397555).

Almost surely, 2^404240728 is an apocalyptic number.

It is an amenable number.

404240728 is a deficient number, since it is larger than the sum of its proper divisors (354120152).

404240728 is a wasteful number, since it uses less digits than its factorization.

404240728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27306 (or 27302 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 404240728 is about 20105.7386832715. The cubic root of 404240728 is about 739.4009810240.

The spelling of 404240728 in words is "four hundred four million, two hundred forty thousand, seven hundred twenty-eight".