18942923 has 4 divisors (see below), whose sum is σ = 19026600. Its totient is φ = 18859248.

The previous prime is 18942907. The next prime is 18942941. The reversal of 18942923 is 32924981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32924981 = 1637 ⋅20113.

It is a cyclic number.

It is not a de Polignac number, because 18942923 - 2⁴ = 18942907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18942983) 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 3 ways as a sum of consecutive naturals, for example, 41498 + ... + 41951.

It is an arithmetic number, because the mean of its divisors is an integer number (4756650).

Almost surely, 2^18942923 is an apocalyptic number.

18942923 is a deficient number, since it is larger than the sum of its proper divisors (83677).

18942923 is an equidigital number, since it uses as much as digits as its factorization.

18942923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83676.

The product of its digits is 31104, while the sum is 38.

The square root of 18942923 is about 4352.3468382012. The cubic root of 18942923 is about 266.5726962300.

The spelling of 18942923 in words is "eighteen million, nine hundred forty-two thousand, nine hundred twenty-three".