404042111 has 24 divisors (see below), whose sum is σ = 475735680. Its totient is φ = 341665280.

The previous prime is 404042071. The next prime is 404042113. The reversal of 404042111 is 111240404.

404042111 = 4275² + 4276² + ... + 4296².

It is not a de Polignac number, because 404042111 - 2⁶ = 404042047 is a prime.

It is a super-2 number, since 2×404042111² = 326500054922672642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 404042111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404042113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181970 + ... + 184176.

It is an arithmetic number, because the mean of its divisors is an integer number (19822320).

Almost surely, 2^404042111 is an apocalyptic number.

404042111 is a deficient number, since it is larger than the sum of its proper divisors (71693569).

404042111 is a wasteful number, since it uses less digits than its factorization.

404042111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335 (or 2324 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 404042111 is about 20100.7987652232. The cubic root of 404042111 is about 739.2798637020.

Adding to 404042111 its reverse (111240404), we get a palindrome (515282515).

The spelling of 404042111 in words is "four hundred four million, forty-two thousand, one hundred eleven".