18120799 has 2 divisors, whose sum is σ = 18120800. Its totient is φ = 18120798.

The previous prime is 18120797. The next prime is 18120829. The reversal of 18120799 is 99702181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18120799 - 2¹ = 18120797 is a prime.

Together with 18120797, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18120797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060399 + 9060400.

It is an arithmetic number, because the mean of its divisors is an integer number (9060400).

Almost surely, 2^18120799 is an apocalyptic number.

18120799 is a deficient number, since it is larger than the sum of its proper divisors (1).

18120799 is an equidigital number, since it uses as much as digits as its factorization.

18120799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 18120799 is about 4256.8531804609. The cubic root of 18120799 is about 262.6590975069.

The spelling of 18120799 in words is "eighteen million, one hundred twenty thousand, seven hundred ninety-nine".