18634243 has 2 divisors, whose sum is σ = 18634244. Its totient is φ = 18634242.

The previous prime is 18634229. The next prime is 18634277. The reversal of 18634243 is 34243681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18634243 - 2¹⁷ = 18503171 is a prime.

It is not a weakly prime, because it can be changed into another prime (18631243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9317121 + 9317122.

It is an arithmetic number, because the mean of its divisors is an integer number (9317122).

Almost surely, 2^18634243 is an apocalyptic number.

18634243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18634243 is an equidigital number, since it uses as much as digits as its factorization.

18634243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 18634243 is about 4316.7398578094. The cubic root of 18634243 is about 265.1168014836.

The spelling of 18634243 in words is "eighteen million, six hundred thirty-four thousand, two hundred forty-three".