404002309 has 4 divisors (see below), whose sum is σ = 404109216. Its totient is φ = 403895404.

The previous prime is 404002307. The next prime is 404002327. The reversal of 404002309 is 903200404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 404002309 - 2¹ = 404002307 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 404002309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404002307) 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, 47569 + ... + 55414.

It is an arithmetic number, because the mean of its divisors is an integer number (101027304).

Almost surely, 2^404002309 is an apocalyptic number.

It is an amenable number.

404002309 is a deficient number, since it is larger than the sum of its proper divisors (106907).

404002309 is a wasteful number, since it uses less digits than its factorization.

404002309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106906.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 404002309 is about 20099.8086806815. The cubic root of 404002309 is about 739.2555875333.

The spelling of 404002309 in words is "four hundred four million, two thousand, three hundred nine".