404431 has 2 divisors, whose sum is σ = 404432. Its totient is φ = 404430.

The previous prime is 404429. The next prime is 404449. The reversal of 404431 is 134404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404431 - 2¹ = 404429 is a prime.

It is a super-2 number, since 2×404431² = 327128867522, which contains 22 as substring.

Together with 404429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202215 + 202216.

It is an arithmetic number, because the mean of its divisors is an integer number (202216).

2⁴⁰⁴⁴³¹ is an apocalyptic number.

404431 is a deficient number, since it is larger than the sum of its proper divisors (1).

404431 is an equidigital number, since it uses as much as digits as its factorization.

404431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 404431 is about 635.9488973180. The cubic root of 404431 is about 73.9516972335.

Adding to 404431 its reverse (134404), we get a palindrome (538835).

The spelling of 404431 in words is "four hundred four thousand, four hundred thirty-one".