18103604 has 6 divisors (see below), whose sum is σ = 31681314. Its totient is φ = 9051800.

The previous prime is 18103573. The next prime is 18103609. The reversal of 18103604 is 40630181.

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 5071504 = 3610^2 + 2252^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18103604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18103609) 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, 2262947 + ... + 2262954.

It is an arithmetic number, because the mean of its divisors is an integer number (5280219).

Almost surely, 2^18103604 is an apocalyptic number.

It is an amenable number.

18103604 is a deficient number, since it is larger than the sum of its proper divisors (13577710).

18103604 is a wasteful number, since it uses less digits than its factorization.

18103604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4525905 (or 4525903 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18103604 is about 4254.8330167000. The cubic root of 18103604 is about 262.5759913022.

Adding to 18103604 its reverse (40630181), we get a palindrome (58733785).

The spelling of 18103604 in words is "eighteen million, one hundred three thousand, six hundred four".