404572393 has 4 divisors (see below), whose sum is σ = 415506820. Its totient is φ = 393637968.

The previous prime is 404572391. The next prime is 404572397. The reversal of 404572393 is 393275404.

It is the 8212-nd star number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 279959824 + 124612569 = 16732^2 + 11163^2 .

It is not a de Polignac number, because 404572393 - 2¹ = 404572391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 10934389 = 404572393 / (4 + 0 + 4 + 5 + 7 + 2 + 3 + 9 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404572391) 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, 5467158 + ... + 5467231.

It is an arithmetic number, because the mean of its divisors is an integer number (103876705).

Almost surely, 2^404572393 is an apocalyptic number.

It is an amenable number.

404572393 is a deficient number, since it is larger than the sum of its proper divisors (10934427).

404572393 is a wasteful number, since it uses less digits than its factorization.

404572393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10934426.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 404572393 is about 20113.9850104349. The cubic root of 404572393 is about 739.6031430622.

The spelling of 404572393 in words is "four hundred four million, five hundred seventy-two thousand, three hundred ninety-three".