18120247 has 2 divisors, whose sum is σ = 18120248. Its totient is φ = 18120246.

The previous prime is 18120241. The next prime is 18120253. The reversal of 18120247 is 74202181.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (18120241) and next prime (18120253).

It is an emirp because it is prime and its reverse (74202181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18120247 - 2⁷ = 18120119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18120241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060123 + 9060124.

It is an arithmetic number, because the mean of its divisors is an integer number (9060124).

Almost surely, 2^18120247 is an apocalyptic number.

18120247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18120247 is an equidigital number, since it uses as much as digits as its factorization.

18120247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 18120247 is about 4256.7883433406. The cubic root of 18120247 is about 262.6564304190.

The spelling of 18120247 in words is "eighteen million, one hundred twenty thousand, two hundred forty-seven".