18859823 has 2 divisors, whose sum is σ = 18859824. Its totient is φ = 18859822.

The previous prime is 18859787. The next prime is 18859829. The reversal of 18859823 is 32895881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18859823 - 2¹⁴ = 18843439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18859829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9429911 + 9429912.

It is an arithmetic number, because the mean of its divisors is an integer number (9429912).

Almost surely, 2^18859823 is an apocalyptic number.

18859823 is a deficient number, since it is larger than the sum of its proper divisors (1).

18859823 is an equidigital number, since it uses as much as digits as its factorization.

18859823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 44.

The square root of 18859823 is about 4342.7897715639. The cubic root of 18859823 is about 266.1823189000.

The spelling of 18859823 in words is "eighteen million, eight hundred fifty-nine thousand, eight hundred twenty-three".