18728149 has 8 divisors (see below), whose sum is σ = 20530080. Its totient is φ = 16942800.

The previous prime is 18728147. The next prime is 18728183. The reversal of 18728149 is 94182781.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18728149 - 2¹ = 18728147 is a prime.

It is a super-3 number, since 3×18728149³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18728147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1714 + ... + 6355.

It is an arithmetic number, because the mean of its divisors is an integer number (2566260).

Almost surely, 2^18728149 is an apocalyptic number.

It is an amenable number.

18728149 is a deficient number, since it is larger than the sum of its proper divisors (1801931).

18728149 is a wasteful number, since it uses less digits than its factorization.

18728149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291.

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

The square root of 18728149 is about 4327.6031472398. The cubic root of 18728149 is about 265.5614015028.

The spelling of 18728149 in words is "eighteen million, seven hundred twenty-eight thousand, one hundred forty-nine".