18923983 has 8 divisors (see below), whose sum is σ = 20931008. Its totient is φ = 16995744.

The previous prime is 18923953. The next prime is 18923987. The reversal of 18923983 is 38932981.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18923983 - 2¹⁷ = 18792911 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 (18923987) 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, 19191 + ... + 20152.

It is an arithmetic number, because the mean of its divisors is an integer number (2616376).

Almost surely, 2^18923983 is an apocalyptic number.

18923983 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18923983 is a deficient number, since it is larger than the sum of its proper divisors (2007025).

18923983 is a wasteful number, since it uses less digits than its factorization.

18923983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39393.

The product of its digits is 93312, while the sum is 43.

The square root of 18923983 is about 4350.1704564304. The cubic root of 18923983 is about 266.4838227493.

The spelling of 18923983 in words is "eighteen million, nine hundred twenty-three thousand, nine hundred eighty-three".