18699983 has 16 divisors (see below), whose sum is σ = 20774880. Its totient is φ = 16751616.

The previous prime is 18699973. The next prime is 18699997. The reversal of 18699983 is 38999681.

It is a cyclic number.

It is not a de Polignac number, because 18699983 - 2¹⁰ = 18698959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18699953) 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, 40691 + ... + 41147.

It is an arithmetic number, because the mean of its divisors is an integer number (1298430).

Almost surely, 2^18699983 is an apocalyptic number.

18699983 is a deficient number, since it is larger than the sum of its proper divisors (2074897).

18699983 is a wasteful number, since it uses less digits than its factorization.

18699983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586.

The product of its digits is 839808, while the sum is 53.

The square root of 18699983 is about 4324.3476964740. The cubic root of 18699983 is about 265.4282052947.

The spelling of 18699983 in words is "eighteen million, six hundred ninety-nine thousand, nine hundred eighty-three".