18140504 has 8 divisors (see below), whose sum is σ = 34013460. Its totient is φ = 9070248.

The previous prime is 18140503. The next prime is 18140519. The reversal of 18140504 is 40504181.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18140504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1133774 + ... + 1133789.

Almost surely, 2^18140504 is an apocalyptic number.

It is an amenable number.

18140504 is a deficient number, since it is larger than the sum of its proper divisors (15872956).

18140504 is a wasteful number, since it uses less digits than its factorization.

18140504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267569 (or 2267565 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18140504 is about 4259.1670547186. The cubic root of 18140504 is about 262.7542703263.

Adding to 18140504 its reverse (40504181), we get a palindrome (58644685).

The spelling of 18140504 in words is "eighteen million, one hundred forty thousand, five hundred four".