18339943 has 4 divisors (see below), whose sum is σ = 18484480. Its totient is φ = 18195408.

The previous prime is 18339913. The next prime is 18340019. The reversal of 18339943 is 34993381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34993381 = 83 ⋅421607.

It is a cyclic number.

It is not a de Polignac number, because 18339943 - 2⁵ = 18339911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18339896 and 18339905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18339913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72078 + ... + 72331.

It is an arithmetic number, because the mean of its divisors is an integer number (4621120).

Almost surely, 2^18339943 is an apocalyptic number.

18339943 is a deficient number, since it is larger than the sum of its proper divisors (144537).

18339943 is a wasteful number, since it uses less digits than its factorization.

18339943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144536.

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

The square root of 18339943 is about 4282.5159661115. The cubic root of 18339943 is about 263.7136808251.

The spelling of 18339943 in words is "eighteen million, three hundred thirty-nine thousand, nine hundred forty-three".