18773923 has 4 divisors (see below), whose sum is σ = 21455920. Its totient is φ = 16091928.

The previous prime is 18773917. The next prime is 18773947. The reversal of 18773923 is 32937781.

18773923 is nontrivially palindromic in base 6.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32937781 = 151 ⋅218131.

It is a cyclic number.

It is not a de Polignac number, because 18773923 - 2¹³ = 18765731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18771923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340988 + ... + 1341001.

It is an arithmetic number, because the mean of its divisors is an integer number (5363980).

Almost surely, 2^18773923 is an apocalyptic number.

18773923 is a deficient number, since it is larger than the sum of its proper divisors (2681997).

18773923 is an equidigital number, since it uses as much as digits as its factorization.

18773923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681996.

The product of its digits is 63504, while the sum is 40.

The square root of 18773923 is about 4332.8885284530. Note that the first 3 decimals coincide. The cubic root of 18773923 is about 265.7775808587. Note that the first 3 decimals are identical.

The spelling of 18773923 in words is "eighteen million, seven hundred seventy-three thousand, nine hundred twenty-three".