18728049 has 16 divisors (see below), whose sum is σ = 26179200. Its totient is φ = 11886336.

The previous prime is 18728023. The next prime is 18728051. The reversal of 18728049 is 94082781.

It is not a de Polignac number, because 18728049 - 2⁹ = 18727537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18727998 and 18728016.

It is not an unprimeable number, because it can be changed into a prime (18728009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18057 + ... + 19065.

It is an arithmetic number, because the mean of its divisors is an integer number (1636200).

Almost surely, 2^18728049 is an apocalyptic number.

It is an amenable number.

18728049 is a deficient number, since it is larger than the sum of its proper divisors (7451151).

18728049 is a wasteful number, since it uses less digits than its factorization.

18728049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18728049 is about 4327.5915934848. The cubic root of 18728049 is about 265.5609288420.

The spelling of 18728049 in words is "eighteen million, seven hundred twenty-eight thousand, forty-nine".