18542404 has 18 divisors (see below), whose sum is σ = 34249614. Its totient is φ = 8782560.

The previous prime is 18542401. The next prime is 18542413. The reversal of 18542404 is 40424581.

It can be written as a sum of positive squares in only one way, i.e., 15618304 + 2924100 = 3952^2 + 1710^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18542401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4977 + ... + 7864.

Almost surely, 2^18542404 is an apocalyptic number.

It is an amenable number.

18542404 is a deficient number, since it is larger than the sum of its proper divisors (15707210).

18542404 is a wasteful number, since it uses less digits than its factorization.

18542404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12883 (or 12862 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 18542404 is about 4306.0891769679. The cubic root of 18542404 is about 264.6805406405.

Adding to 18542404 its reverse (40424581), we get a palindrome (58966985).

The spelling of 18542404 in words is "eighteen million, five hundred forty-two thousand, four hundred four".