18723043 has 2 divisors, whose sum is σ = 18723044. Its totient is φ = 18723042.

The previous prime is 18723041. The next prime is 18723053. The reversal of 18723043 is 34032781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18723043 - 2¹ = 18723041 is a prime.

Together with 18723041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18723041) 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 as a sum of consecutive naturals, namely, 9361521 + 9361522.

It is an arithmetic number, because the mean of its divisors is an integer number (9361522).

Almost surely, 2^18723043 is an apocalyptic number.

18723043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18723043 is an equidigital number, since it uses as much as digits as its factorization.

18723043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 18723043 is about 4327.0131730791. The cubic root of 18723043 is about 265.5372652901.

The spelling of 18723043 in words is "eighteen million, seven hundred twenty-three thousand, forty-three".