404039988 has 288 divisors, whose sum is σ = 1268047872. Its totient is φ = 111196800.

The previous prime is 404039983. The next prime is 404040023. The reversal of 404039988 is 889930404.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404039983) 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 95 ways as a sum of consecutive naturals, for example, 7623370 + ... + 7623422.

It is an arithmetic number, because the mean of its divisors is an integer number (4402944).

Almost surely, 2^404039988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404039988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (634023936).

404039988 is an abundant number, since it is smaller than the sum of its proper divisors (864007884).

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

404039988 is a wasteful number, since it uses less digits than its factorization.

404039988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 404039988 is about 20100.7459563072. The cubic root of 404039988 is about 739.2785688750.

The spelling of 404039988 in words is "four hundred four million, thirty-nine thousand, nine hundred eighty-eight".