18971323 has 4 divisors (see below), whose sum is σ = 21681520. Its totient is φ = 16261128.

The previous prime is 18971317. The next prime is 18971347. The reversal of 18971323 is 32317981.

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 18971323 - 2⁹ = 18970811 is a prime.

It is a super-2 number, since 2×18971323² = 719822192740658, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18971363) 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, 1355088 + ... + 1355101.

It is an arithmetic number, because the mean of its divisors is an integer number (5420380).

Almost surely, 2^18971323 is an apocalyptic number.

18971323 is a deficient number, since it is larger than the sum of its proper divisors (2710197).

18971323 is an equidigital number, since it uses as much as digits as its factorization.

18971323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710196.

The product of its digits is 9072, while the sum is 34.

The square root of 18971323 is about 4355.6082238879. The cubic root of 18971323 is about 266.7058485829.

The spelling of 18971323 in words is "eighteen million, nine hundred seventy-one thousand, three hundred twenty-three".