404351391 has 4 divisors (see below), whose sum is σ = 539135192. Its totient is φ = 269567592.

The previous prime is 404351377. The next prime is 404351399. The reversal of 404351391 is 193153404.

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

It is not a de Polignac number, because 404351391 - 2¹⁹ = 403827103 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 (404351399) 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, 67391896 + ... + 67391901.

It is an arithmetic number, because the mean of its divisors is an integer number (134783798).

Almost surely, 2^404351391 is an apocalyptic number.

404351391 is a deficient number, since it is larger than the sum of its proper divisors (134783801).

404351391 is a wasteful number, since it uses less digits than its factorization.

404351391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134783800.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 404351391 is about 20108.4905201758. The cubic root of 404351391 is about 739.4684464884.

The spelling of 404351391 in words is "four hundred four million, three hundred fifty-one thousand, three hundred ninety-one".