404390305 has 16 divisors (see below), whose sum is σ = 560525184. Its totient is φ = 276801280.

The previous prime is 404390293. The next prime is 404390309. The reversal of 404390305 is 503093404.

It is not a de Polignac number, because 404390305 - 2¹⁵ = 404357537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404390309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215317 + ... + 217186.

It is an arithmetic number, because the mean of its divisors is an integer number (35032824).

Almost surely, 2^404390305 is an apocalyptic number.

It is an amenable number.

404390305 is a deficient number, since it is larger than the sum of its proper divisors (156134879).

404390305 is a wasteful number, since it uses less digits than its factorization.

404390305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432536.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 404390305 is about 20109.4580981189. The cubic root of 404390305 is about 739.4921674010.

The spelling of 404390305 in words is "four hundred four million, three hundred ninety thousand, three hundred five".