404021232 has 30 divisors (see below), whose sum is σ = 1130698712. Its totient is φ = 134673696.

The previous prime is 404021231. The next prime is 404021237. The reversal of 404021232 is 232120404.

It is a super-4 number, since 4×404021232⁴ (a number of 36 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404021231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1402708 + ... + 1402995.

Almost surely, 2^404021232 is an apocalyptic number.

It is an amenable number.

404021232 is an abundant number, since it is smaller than the sum of its proper divisors (726677480).

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

404021232 is a wasteful number, since it uses less digits than its factorization.

404021232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805717 (or 2805708 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 404021232 is about 20100.2794010432. The cubic root of 404021232 is about 739.2671293115.

Adding to 404021232 its reverse (232120404), we get a palindrome (636141636).

The spelling of 404021232 in words is "four hundred four million, twenty-one thousand, two hundred thirty-two".