18051428 has 6 divisors (see below), whose sum is σ = 31590006. Its totient is φ = 9025712.

The previous prime is 18051413. The next prime is 18051457. The reversal of 18051428 is 82415081.

It can be written as a sum of positive squares in only one way, i.e., 13897984 + 4153444 = 3728^2 + 2038^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18051428.

It is an unprimeable number.

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, 2256425 + ... + 2256432.

It is an arithmetic number, because the mean of its divisors is an integer number (5265001).

Almost surely, 2^18051428 is an apocalyptic number.

It is an amenable number.

18051428 is a deficient number, since it is larger than the sum of its proper divisors (13538578).

18051428 is a wasteful number, since it uses less digits than its factorization.

18051428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512861 (or 4512859 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18051428 is about 4248.6972120875. The cubic root of 18051428 is about 262.3234937390.

The spelling of 18051428 in words is "eighteen million, fifty-one thousand, four hundred twenty-eight".