404645399 has 4 divisors (see below), whose sum is σ = 405238536. Its totient is φ = 404052264.

The previous prime is 404645393. The next prime is 404645447. The reversal of 404645399 is 993546404.

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-404645399 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 (404645393) 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, 295544 + ... + 296909.

It is an arithmetic number, because the mean of its divisors is an integer number (101309634).

Almost surely, 2^404645399 is an apocalyptic number.

404645399 is a deficient number, since it is larger than the sum of its proper divisors (593137).

404645399 is an equidigital number, since it uses as much as digits as its factorization.

404645399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593136.

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 404645399 is about 20115.7997355313. The cubic root of 404645399 is about 739.6476280712.

The spelling of 404645399 in words is "four hundred four million, six hundred forty-five thousand, three hundred ninety-nine".