18930665 has 16 divisors (see below), whose sum is σ = 24591168. Its totient is φ = 13907136.

The previous prime is 18930661. The next prime is 18930683. The reversal of 18930665 is 56603981.

It is a cyclic number.

It is not a de Polignac number, because 18930665 - 2² = 18930661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18930661) 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 15 ways as a sum of consecutive naturals, for example, 14114 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (1536948).

Almost surely, 2^18930665 is an apocalyptic number.

It is an amenable number.

18930665 is a deficient number, since it is larger than the sum of its proper divisors (5660503).

18930665 is a wasteful number, since it uses less digits than its factorization.

18930665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 18930665 is about 4350.9384045284. The cubic root of 18930665 is about 266.5151839302.

The spelling of 18930665 in words is "eighteen million, nine hundred thirty thousand, six hundred sixty-five".