404642 has 12 divisors (see below), whose sum is σ = 706230. Its totient is φ = 173376.

The previous prime is 404597. The next prime is 404671. The reversal of 404642 is 246404.

It can be written as a sum of positive squares in only one way, i.e., 337561 + 67081 = 581^2 + 259^2 .

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

404642 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1967 + ... + 2162.

2⁴⁰⁴⁶⁴² is an apocalyptic number.

404642 is a deficient number, since it is larger than the sum of its proper divisors (301588).

404642 is a wasteful number, since it uses less digits than its factorization.

404642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145 (or 4138 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 404642 is about 636.1147695188. The cubic root of 404642 is about 73.9645557065.

The spelling of 404642 in words is "four hundred four thousand, six hundred forty-two".