18189428 has 18 divisors (see below), whose sum is σ = 32345586. Its totient is φ = 8950128.

The previous prime is 18189427. The next prime is 18189433. The reversal of 18189428 is 82498181.

It can be written as a sum of positive squares in only one way, i.e., 9498724 + 8690704 = 3082^2 + 2948^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18189421) 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 in 5 ways as a sum of consecutive naturals, for example, 17450 + ... + 18462.

It is an arithmetic number, because the mean of its divisors is an integer number (1796977).

Almost surely, 2^18189428 is an apocalyptic number.

It is an amenable number.

18189428 is a deficient number, since it is larger than the sum of its proper divisors (14156158).

18189428 is a wasteful number, since it uses less digits than its factorization.

18189428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151 (or 1082 counting only the distinct ones).

The product of its digits is 36864, while the sum is 41.

The square root of 18189428 is about 4264.9065640410. The cubic root of 18189428 is about 262.9902698478.

The spelling of 18189428 in words is "eighteen million, one hundred eighty-nine thousand, four hundred twenty-eight".