18149728 has 12 divisors (see below), whose sum is σ = 35732340. Its totient is φ = 9074848.

The previous prime is 18149713. The next prime is 18149743. The reversal of 18149728 is 82794181.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18149713) and next prime (18149743).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283558 + ... + 283621.

It is an arithmetic number, because the mean of its divisors is an integer number (2977695).

Almost surely, 2^18149728 is an apocalyptic number.

It is an amenable number.

18149728 is a deficient number, since it is larger than the sum of its proper divisors (17582612).

18149728 is an equidigital number, since it uses as much as digits as its factorization.

18149728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567189 (or 567181 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 18149728 is about 4260.2497579367. The cubic root of 18149728 is about 262.7987974742.

The spelling of 18149728 in words is "eighteen million, one hundred forty-nine thousand, seven hundred twenty-eight".