404297391 has 4 divisors (see below), whose sum is σ = 539063192. Its totient is φ = 269531592.

The previous prime is 404297357. The next prime is 404297393. The reversal of 404297391 is 193792404.

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

It is not a de Polignac number, because 404297391 - 2¹³ = 404289199 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 (404297393) 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, 67382896 + ... + 67382901.

It is an arithmetic number, because the mean of its divisors is an integer number (134765798).

Almost surely, 2^404297391 is an apocalyptic number.

404297391 is a deficient number, since it is larger than the sum of its proper divisors (134765801).

404297391 is a wasteful number, since it uses less digits than its factorization.

404297391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134765800.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 404297391 is about 20107.1477589438. The cubic root of 404297391 is about 739.4355270403.

The spelling of 404297391 in words is "four hundred four million, two hundred ninety-seven thousand, three hundred ninety-one".