18212347 has 2 divisors, whose sum is σ = 18212348. Its totient is φ = 18212346.

The previous prime is 18212333. The next prime is 18212353. The reversal of 18212347 is 74321281.

It is a strong prime.

It is an emirp because it is prime and its reverse (74321281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18212347 is a prime.

It is not a weakly prime, because it can be changed into another prime (18212387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106173 + 9106174.

It is an arithmetic number, because the mean of its divisors is an integer number (9106174).

Almost surely, 2^18212347 is an apocalyptic number.

18212347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18212347 is an equidigital number, since it uses as much as digits as its factorization.

18212347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 18212347 is about 4267.5926469147. The cubic root of 18212347 is about 263.1006809465.

The spelling of 18212347 in words is "eighteen million, two hundred twelve thousand, three hundred forty-seven".