404491 has 8 divisors (see below), whose sum is σ = 434000. Its totient is φ = 375840.

The previous prime is 404489. The next prime is 404497. The reversal of 404491 is 194404.

It is a happy number.

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 404491 - 2¹ = 404489 is a prime.

It is a super-2 number, since 2×404491² = 327225938162, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (404497) 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, 985 + ... + 1333.

It is an arithmetic number, because the mean of its divisors is an integer number (54250).

2⁴⁰⁴⁴⁹¹ is an apocalyptic number.

404491 is a deficient number, since it is larger than the sum of its proper divisors (29509).

404491 is a wasteful number, since it uses less digits than its factorization.

404491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 404491 is about 635.9960691702. The cubic root of 404491 is about 73.9553541263.

Adding to 404491 its reverse (194404), we get a palindrome (598895).

The spelling of 404491 in words is "four hundred four thousand, four hundred ninety-one".