18072247 has 2 divisors, whose sum is σ = 18072248. Its totient is φ = 18072246.

The previous prime is 18072209. The next prime is 18072259. The reversal of 18072247 is 74227081.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18072247 is a prime.

It is a super-2 number, since 2×18072247² = 653212223258018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18072347) 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, 9036123 + 9036124.

It is an arithmetic number, because the mean of its divisors is an integer number (9036124).

Almost surely, 2^18072247 is an apocalyptic number.

18072247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18072247 is an equidigital number, since it uses as much as digits as its factorization.

18072247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 18072247 is about 4251.1465512259. The cubic root of 18072247 is about 262.4243022848.

It can be divided in two parts, 180 and 72247, that added together give a palindrome (72427).

The spelling of 18072247 in words is "eighteen million, seventy-two thousand, two hundred forty-seven".