18431923 has 2 divisors, whose sum is σ = 18431924. Its totient is φ = 18431922.

The previous prime is 18431879. The next prime is 18431951. The reversal of 18431923 is 32913481.

It is a strong prime.

It is an emirp because it is prime and its reverse (32913481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18431923 - 2¹⁷ = 18300851 is a prime.

It is not a weakly prime, because it can be changed into another prime (18431983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9215961 + 9215962.

It is an arithmetic number, because the mean of its divisors is an integer number (9215962).

Almost surely, 2^18431923 is an apocalyptic number.

18431923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18431923 is an equidigital number, since it uses as much as digits as its factorization.

18431923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 18431923 is about 4293.2415492259. The cubic root of 18431923 is about 264.1538120748.

The spelling of 18431923 in words is "eighteen million, four hundred thirty-one thousand, nine hundred twenty-three".