18157028 has 12 divisors (see below), whose sum is σ = 33156480. Its totient is φ = 8683752.

The previous prime is 18157019. The next prime is 18157031. The reversal of 18157028 is 82075181.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18156985 and 18157003.

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 in 3 ways as a sum of consecutive naturals, for example, 98588 + ... + 98771.

It is an arithmetic number, because the mean of its divisors is an integer number (2763040).

Almost surely, 2^18157028 is an apocalyptic number.

It is an amenable number.

18157028 is a deficient number, since it is larger than the sum of its proper divisors (14999452).

18157028 is a wasteful number, since it uses less digits than its factorization.

18157028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197386 (or 197384 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 18157028 is about 4261.1064290862. The cubic root of 18157028 is about 262.8340261762.

The spelling of 18157028 in words is "eighteen million, one hundred fifty-seven thousand, twenty-eight".