404469 has 12 divisors (see below), whose sum is σ = 629356. Its totient is φ = 248832.

The previous prime is 404461. The next prime is 404483. The reversal of 404469 is 964404.

404469 = 112² + 113² + ... + 137².

It can be written as a sum of positive squares in 2 ways, for example, as 26244 + 378225 = 162^2 + 615^2 .

It is not a de Polignac number, because 404469 - 2³ = 404461 is a prime.

It is a super-2 number, since 2×404469² = 327190343922, which contains 22 as substring.

It is an Ulam number.

404469 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1612 + ... + 1845.

2⁴⁰⁴⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

404469 is a deficient number, since it is larger than the sum of its proper divisors (224887).

404469 is a wasteful number, since it uses less digits than its factorization.

404469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476 (or 3473 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 404469 is about 635.9787732307. The cubic root of 404469 is about 73.9540133076.

Adding to 404469 its sum of digits (27), we get a square (404496 = 636²).

The spelling of 404469 in words is "four hundred four thousand, four hundred sixty-nine".