18212923 has 4 divisors (see below), whose sum is σ = 18600480. Its totient is φ = 17825368.

The previous prime is 18212893. The next prime is 18212947. The reversal of 18212923 is 32921281.

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 18212923 - 2¹³ = 18204731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18212891 and 18212900.

It is not an unprimeable number, because it can be changed into a prime (18212993) 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, 193708 + ... + 193801.

It is an arithmetic number, because the mean of its divisors is an integer number (4650120).

Almost surely, 2^18212923 is an apocalyptic number.

18212923 is a deficient number, since it is larger than the sum of its proper divisors (387557).

18212923 is an equidigital number, since it uses as much as digits as its factorization.

18212923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387556.

The product of its digits is 1728, while the sum is 28.

The square root of 18212923 is about 4267.6601317350. The cubic root of 18212923 is about 263.1034546032.

The spelling of 18212923 in words is "eighteen million, two hundred twelve thousand, nine hundred twenty-three".