18744347 has 2 divisors, whose sum is σ = 18744348. Its totient is φ = 18744346.

The previous prime is 18744331. The next prime is 18744361. The reversal of 18744347 is 74344781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18744347 - 2⁴ = 18744331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18744347.

It is not a weakly prime, because it can be changed into another prime (18744307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9372173 + 9372174.

It is an arithmetic number, because the mean of its divisors is an integer number (9372174).

Almost surely, 2^18744347 is an apocalyptic number.

18744347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18744347 is an equidigital number, since it uses as much as digits as its factorization.

18744347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 38.

The square root of 18744347 is about 4329.4742175003. The cubic root of 18744347 is about 265.6379409059.

It can be divided in two parts, 18744 and 347, that added together give a palindrome (19091).

The spelling of 18744347 in words is "eighteen million, seven hundred forty-four thousand, three hundred forty-seven".