404993163 has 4 divisors (see below), whose sum is σ = 539990888. Its totient is φ = 269995440.

The previous prime is 404993129. The next prime is 404993179. The reversal of 404993163 is 361399404.

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

It is not a de Polignac number, because 404993163 - 2¹⁷ = 404862091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404993663) 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, 67498858 + ... + 67498863.

It is an arithmetic number, because the mean of its divisors is an integer number (134997722).

Almost surely, 2^404993163 is an apocalyptic number.

404993163 is a deficient number, since it is larger than the sum of its proper divisors (134997725).

404993163 is a wasteful number, since it uses less digits than its factorization.

404993163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134997724.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 404993163 is about 20124.4419301505. The cubic root of 404993163 is about 739.8594589444.

The spelling of 404993163 in words is "four hundred four million, nine hundred ninety-three thousand, one hundred sixty-three".