18028949 has 8 divisors (see below), whose sum is σ = 18661632. Its totient is φ = 17399520.

The previous prime is 18028939. The next prime is 18028951. The reversal of 18028949 is 94982081.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18028949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18028919) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16937 + ... + 17969.

It is an arithmetic number, because the mean of its divisors is an integer number (2332704).

Almost surely, 2^18028949 is an apocalyptic number.

It is an amenable number.

18028949 is a deficient number, since it is larger than the sum of its proper divisors (632683).

18028949 is a wasteful number, since it uses less digits than its factorization.

18028949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 18028949 is about 4246.0509888601. The cubic root of 18028949 is about 262.2145601741.

The spelling of 18028949 in words is "eighteen million, twenty-eight thousand, nine hundred forty-nine".