18212147 has 2 divisors, whose sum is σ = 18212148. Its totient is φ = 18212146.

The previous prime is 18212143. The next prime is 18212189. The reversal of 18212147 is 74121281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18212147 - 2² = 18212143 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18212143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106073 + 9106074.

It is an arithmetic number, because the mean of its divisors is an integer number (9106074).

Almost surely, 2^18212147 is an apocalyptic number.

18212147 is a deficient number, since it is larger than the sum of its proper divisors (1).

18212147 is an equidigital number, since it uses as much as digits as its factorization.

18212147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 26.

The square root of 18212147 is about 4267.5692144358. The cubic root of 18212147 is about 263.0997178576.

The spelling of 18212147 in words is "eighteen million, two hundred twelve thousand, one hundred forty-seven".