18489623 has 2 divisors, whose sum is σ = 18489624. Its totient is φ = 18489622.

The previous prime is 18489571. The next prime is 18489629. The reversal of 18489623 is 32698481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18489623 - 2¹⁰ = 18488599 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18489629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9244811 + 9244812.

It is an arithmetic number, because the mean of its divisors is an integer number (9244812).

Almost surely, 2^18489623 is an apocalyptic number.

18489623 is a deficient number, since it is larger than the sum of its proper divisors (1).

18489623 is an equidigital number, since it uses as much as digits as its factorization.

18489623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 41.

The square root of 18489623 is about 4299.9561625672. The cubic root of 18489623 is about 264.4291640314.

The spelling of 18489623 in words is "eighteen million, four hundred eighty-nine thousand, six hundred twenty-three".