404330639 has 4 divisors (see below), whose sum is σ = 421910256. Its totient is φ = 386751024.

The previous prime is 404330627. The next prime is 404330681. The reversal of 404330639 is 936033404.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404330639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404330039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8789774 + ... + 8789819.

It is an arithmetic number, because the mean of its divisors is an integer number (105477564).

Almost surely, 2^404330639 is an apocalyptic number.

404330639 is a deficient number, since it is larger than the sum of its proper divisors (17579617).

404330639 is a wasteful number, since it uses less digits than its factorization.

404330639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17579616.

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 404330639 is about 20107.9745126156. The cubic root of 404330639 is about 739.4557960132.

The spelling of 404330639 in words is "four hundred four million, three hundred thirty thousand, six hundred thirty-nine".