404578 has 4 divisors (see below), whose sum is σ = 606870. Its totient is φ = 202288.

The previous prime is 404557. The next prime is 404597. The reversal of 404578 is 875404.

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

It can be written as a sum of positive squares in only one way, i.e., 393129 + 11449 = 627^2 + 107^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101143 + ... + 101146.

2⁴⁰⁴⁵⁷⁸ is an apocalyptic number.

404578 is a deficient number, since it is larger than the sum of its proper divisors (202292).

404578 is a wasteful number, since it uses less digits than its factorization.

404578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202291.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 404578 is about 636.0644621420. The cubic root of 404578 is about 73.9606559785.

Subtracting from 404578 its sum of digits (28), we obtain a triangular number (404550 = T₈₉₉).

The spelling of 404578 in words is "four hundred four thousand, five hundred seventy-eight".