18156983 has 4 divisors (see below), whose sum is σ = 19553688. Its totient is φ = 16760280.

The previous prime is 18156977. The next prime is 18157001. The reversal of 18156983 is 38965181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18156983 - 2⁴ = 18156967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18156983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18156923) 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 3 ways as a sum of consecutive naturals, for example, 698333 + ... + 698358.

It is an arithmetic number, because the mean of its divisors is an integer number (4888422).

Almost surely, 2^18156983 is an apocalyptic number.

18156983 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18156983 is a deficient number, since it is larger than the sum of its proper divisors (1396705).

18156983 is a wasteful number, since it uses less digits than its factorization.

18156983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396704.

The product of its digits is 51840, while the sum is 41.

The square root of 18156983 is about 4261.1011487642. The cubic root of 18156983 is about 262.8338090419.

The spelling of 18156983 in words is "eighteen million, one hundred fifty-six thousand, nine hundred eighty-three".