18042404 has 6 divisors (see below), whose sum is σ = 31574214. Its totient is φ = 9021200.

The previous prime is 18042361. The next prime is 18042463. The reversal of 18042404 is 40424081.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 3602404 = 3800^2 + 1898^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18042404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2255297 + ... + 2255304.

It is an arithmetic number, because the mean of its divisors is an integer number (5262369).

Almost surely, 2^18042404 is an apocalyptic number.

It is an amenable number.

18042404 is a deficient number, since it is larger than the sum of its proper divisors (13531810).

18042404 is a wasteful number, since it uses less digits than its factorization.

18042404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510605 (or 4510603 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 18042404 is about 4247.6351067388. The cubic root of 18042404 is about 262.2797741733.

Adding to 18042404 its reverse (40424081), we get a palindrome (58466485).

The spelling of 18042404 in words is "eighteen million, forty-two thousand, four hundred four".