18639343 has 4 divisors (see below), whose sum is σ = 18944968. Its totient is φ = 18333720.

The previous prime is 18639331. The next prime is 18639347. The reversal of 18639343 is 34393681.

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 18639343 - 2⁵ = 18639311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639347) 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, 152721 + ... + 152842.

It is an arithmetic number, because the mean of its divisors is an integer number (4736242).

Almost surely, 2^18639343 is an apocalyptic number.

18639343 is a deficient number, since it is larger than the sum of its proper divisors (305625).

18639343 is an equidigital number, since it uses as much as digits as its factorization.

18639343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305624.

The product of its digits is 46656, while the sum is 37.

The square root of 18639343 is about 4317.3305409709. The cubic root of 18639343 is about 265.1409858549.

The spelling of 18639343 in words is "eighteen million, six hundred thirty-nine thousand, three hundred forty-three".