18399343 has 4 divisors (see below), whose sum is σ = 18539928. Its totient is φ = 18258760.

The previous prime is 18399319. The next prime is 18399349. The reversal of 18399343 is 34399381.

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 18399343 - 2¹³ = 18391151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18399296 and 18399305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18399349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70096 + ... + 70357.

It is an arithmetic number, because the mean of its divisors is an integer number (4634982).

Almost surely, 2^18399343 is an apocalyptic number.

18399343 is a deficient number, since it is larger than the sum of its proper divisors (140585).

18399343 is a wasteful number, since it uses less digits than its factorization.

18399343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140584.

The product of its digits is 69984, while the sum is 40.

The square root of 18399343 is about 4289.4455352644. The cubic root of 18399343 is about 263.9980821333.

The spelling of 18399343 in words is "eighteen million, three hundred ninety-nine thousand, three hundred forty-three".