404433721 has 4 divisors (see below), whose sum is σ = 411063844. Its totient is φ = 397803600.

The previous prime is 404433713. The next prime is 404433737. The reversal of 404433721 is 127334404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58064400 + 346369321 = 7620^2 + 18611^2 .

It is a cyclic number.

It is not a de Polignac number, because 404433721 - 2³ = 404433713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404433721.

It is not an unprimeable number, because it can be changed into a prime (404437721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3314970 + ... + 3315091.

It is an arithmetic number, because the mean of its divisors is an integer number (102765961).

Almost surely, 2^404433721 is an apocalyptic number.

It is an amenable number.

404433721 is a deficient number, since it is larger than the sum of its proper divisors (6630123).

404433721 is an equidigital number, since it uses as much as digits as its factorization.

404433721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630122.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 404433721 is about 20110.5375611892. The cubic root of 404433721 is about 739.5186308141.

The spelling of 404433721 in words is "four hundred four million, four hundred thirty-three thousand, seven hundred twenty-one".