18449923 has 2 divisors, whose sum is σ = 18449924. Its totient is φ = 18449922.

The previous prime is 18449911. The next prime is 18449953. The reversal of 18449923 is 32994481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18449923 - 2⁵ = 18449891 is a prime.

It is not a weakly prime, because it can be changed into another prime (18449953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9224961 + 9224962.

It is an arithmetic number, because the mean of its divisors is an integer number (9224962).

Almost surely, 2^18449923 is an apocalyptic number.

18449923 is a deficient number, since it is larger than the sum of its proper divisors (1).

18449923 is an equidigital number, since it uses as much as digits as its factorization.

18449923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 18449923 is about 4295.3373557848. The cubic root of 18449923 is about 264.2397720273.

The spelling of 18449923 in words is "eighteen million, four hundred forty-nine thousand, nine hundred twenty-three".