404542 has 8 divisors (see below), whose sum is σ = 614376. Its totient is φ = 199752.

The previous prime is 404539. The next prime is 404557. The reversal of 404542 is 245404.

404542 is nontrivially palindromic in base 15.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053 + ... + 1384.

It is an arithmetic number, because the mean of its divisors is an integer number (76797).

2⁴⁰⁴⁵⁴² is an apocalyptic number.

404542 is a deficient number, since it is larger than the sum of its proper divisors (209834).

404542 is a wasteful number, since it uses less digits than its factorization.

404542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 404542 is about 636.0361624939. The cubic root of 404542 is about 73.9584622008.

Adding to 404542 its reverse (245404), we get a palindrome (649946).

It can be divided in two parts, 40454 and 2, that multiplied together give a palindrome (80908).

The spelling of 404542 in words is "four hundred four thousand, five hundred forty-two".