404393 has 8 divisors (see below), whose sum is σ = 446880. Its totient is φ = 362880.

The previous prime is 404389. The next prime is 404399. The reversal of 404393 is 393404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404393 - 2² = 404389 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 878 + ... + 1256.

It is an arithmetic number, because the mean of its divisors is an integer number (55860).

2⁴⁰⁴³⁹³ is an apocalyptic number.

It is an amenable number.

404393 is a deficient number, since it is larger than the sum of its proper divisors (42487).

404393 is a wasteful number, since it uses less digits than its factorization.

404393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 404393 is about 635.9190200018. The cubic root of 404393 is about 73.9493810143.

Multiplying 404393 by its sum of digits (23), we get a palindrome (9301039).

Adding to 404393 its reverse (393404), we get a palindrome (797797).

It can be divided in two parts, 404 and 393, that added together give a palindrome (797).

The spelling of 404393 in words is "four hundred four thousand, three hundred ninety-three".