18243247 has 8 divisors (see below), whose sum is σ = 20022912. Its totient is φ = 16483800.

The previous prime is 18243241. The next prime is 18243293. The reversal of 18243247 is 74234281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18243247 - 2¹⁹ = 17718959 is a prime.

It is a super-2 number, since 2×18243247² = 665632122206018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3129 + ... + 6802.

It is an arithmetic number, because the mean of its divisors is an integer number (2502864).

Almost surely, 2^18243247 is an apocalyptic number.

18243247 is a deficient number, since it is larger than the sum of its proper divisors (1779665).

18243247 is a wasteful number, since it uses less digits than its factorization.

18243247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10109.

The product of its digits is 10752, while the sum is 31.

The square root of 18243247 is about 4271.2114206628. The cubic root of 18243247 is about 263.2493935671.

The spelling of 18243247 in words is "eighteen million, two hundred forty-three thousand, two hundred forty-seven".