404042 has 4 divisors (see below), whose sum is σ = 606066. Its totient is φ = 202020.

The previous prime is 404029. The next prime is 404051. The reversal of 404042 is 240404.

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., 346921 + 57121 = 589^2 + 239^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101009 + ... + 101012.

2⁴⁰⁴⁰⁴² is an apocalyptic number.

404042 is a deficient number, since it is larger than the sum of its proper divisors (202024).

404042 is a wasteful number, since it uses less digits than its factorization.

404042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202023.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 404042 is about 635.6429815549. The cubic root of 404042 is about 73.9279796003.

Adding to 404042 its reverse (240404), we get a palindrome (644446).

It can be divided in two parts, 40404 and 2, that multiplied together give a palindrome (80808).

The spelling of 404042 in words is "four hundred four thousand, forty-two", and thus it is an iban number.