404393261 has 4 divisors (see below), whose sum is σ = 404919900. Its totient is φ = 403866624.

The previous prime is 404393237. The next prime is 404393281. The reversal of 404393261 is 162393404.

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 203604361 + 200788900 = 14269^2 + 14170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404393261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404393281) 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, 262166 + ... + 263703.

It is an arithmetic number, because the mean of its divisors is an integer number (101229975).

Almost surely, 2^404393261 is an apocalyptic number.

It is an amenable number.

404393261 is a deficient number, since it is larger than the sum of its proper divisors (526639).

404393261 is an equidigital number, since it uses as much as digits as its factorization.

404393261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526638.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 404393261 is about 20109.5315957384. The cubic root of 404393261 is about 739.4939692358.

The spelling of 404393261 in words is "four hundred four million, three hundred ninety-three thousand, two hundred sixty-one".