18122247 has 24 divisors (see below), whose sum is σ = 30755088. Its totient is φ = 10137600.

The previous prime is 18122243. The next prime is 18122309. The reversal of 18122247 is 74222181.

It is not a de Polignac number, because 18122247 - 2² = 18122243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18122247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5754 + ... + 8327.

It is an arithmetic number, because the mean of its divisors is an integer number (1281462).

Almost surely, 2^18122247 is an apocalyptic number.

18122247 is a deficient number, since it is larger than the sum of its proper divisors (12632841).

18122247 is a wasteful number, since it uses less digits than its factorization.

18122247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14111 (or 14108 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 18122247 is about 4257.0232557504. The cubic root of 18122247 is about 262.6660935237. Note that the first 3 decimals are identical.

It can be divided in two parts, 18 and 122247, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 18122247 in words is "eighteen million, one hundred twenty-two thousand, two hundred forty-seven".