18912323 has 4 divisors (see below), whose sum is σ = 18922008. Its totient is φ = 18902640.

The previous prime is 18912317. The next prime is 18912331. The reversal of 18912323 is 32321981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18912323 - 2⁶ = 18912259 is a prime.

It is a super-2 number, since 2×18912323² = 715351922512658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18912343) 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, 773 + ... + 6198.

It is an arithmetic number, because the mean of its divisors is an integer number (4730502).

Almost surely, 2^18912323 is an apocalyptic number.

18912323 is a deficient number, since it is larger than the sum of its proper divisors (9685).

18912323 is an equidigital number, since it uses as much as digits as its factorization.

18912323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9684.

The product of its digits is 2592, while the sum is 29.

The square root of 18912323 is about 4348.8300725597. The cubic root of 18912323 is about 266.4290802257.

The spelling of 18912323 in words is "eighteen million, nine hundred twelve thousand, three hundred twenty-three".