18646423 has 2 divisors, whose sum is σ = 18646424. Its totient is φ = 18646422.

The previous prime is 18646417. The next prime is 18646427. The reversal of 18646423 is 32464681.

18646423 is nontrivially palindromic in base 13.

It is a strong prime.

It is an emirp because it is prime and its reverse (32464681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18646423 - 2²¹ = 16549271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18646427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9323211 + 9323212.

It is an arithmetic number, because the mean of its divisors is an integer number (9323212).

Almost surely, 2^18646423 is an apocalyptic number.

18646423 is a deficient number, since it is larger than the sum of its proper divisors (1).

18646423 is an equidigital number, since it uses as much as digits as its factorization.

18646423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 34.

The square root of 18646423 is about 4318.1504142399. The cubic root of 18646423 is about 265.1745521408.

The spelling of 18646423 in words is "eighteen million, six hundred forty-six thousand, four hundred twenty-three".