18011828 has 6 divisors (see below), whose sum is σ = 31520706. Its totient is φ = 9005912.

The previous prime is 18011821. The next prime is 18011831. The reversal of 18011828 is 82811081.

It can be written as a sum of positive squares in only one way, i.e., 13118884 + 4892944 = 3622^2 + 2212^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18011828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18011821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2251475 + ... + 2251482.

It is an arithmetic number, because the mean of its divisors is an integer number (5253451).

Almost surely, 2^18011828 is an apocalyptic number.

It is an amenable number.

18011828 is a deficient number, since it is larger than the sum of its proper divisors (13508878).

18011828 is a wasteful number, since it uses less digits than its factorization.

18011828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502961 (or 4502959 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 18011828 is about 4244.0344013686. The cubic root of 18011828 is about 262.1315307949.

The spelling of 18011828 in words is "eighteen million, eleven thousand, eight hundred twenty-eight".