18240343 has 4 divisors (see below), whose sum is σ = 19898568. Its totient is φ = 16582120.

The previous prime is 18240331. The next prime is 18240353. The reversal of 18240343 is 34304281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18240343 - 2¹⁷ = 18109271 is a prime.

It is a super-2 number, since 2×18240343² = 665420225515298, 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 (18240353) 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 in 3 ways as a sum of consecutive naturals, for example, 829096 + ... + 829117.

It is an arithmetic number, because the mean of its divisors is an integer number (4974642).

Almost surely, 2^18240343 is an apocalyptic number.

18240343 is a deficient number, since it is larger than the sum of its proper divisors (1658225).

18240343 is a wasteful number, since it uses less digits than its factorization.

18240343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658224.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 18240343 is about 4270.8714567404. The cubic root of 18240343 is about 263.2354246210.

The spelling of 18240343 in words is "eighteen million, two hundred forty thousand, three hundred forty-three".