18639334 has 8 divisors (see below), whose sum is σ = 31953168. Its totient is φ = 7988280.

The previous prime is 18639331. The next prime is 18639347. The reversal of 18639334 is 43393681.

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

It is a junction number, because it is equal to n+sod(n) for n = 18639293 and 18639302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639331) 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, 665677 + ... + 665704.

It is an arithmetic number, because the mean of its divisors is an integer number (3994146).

Almost surely, 2^18639334 is an apocalyptic number.

18639334 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18639334 is a deficient number, since it is larger than the sum of its proper divisors (13313834).

18639334 is a wasteful number, since it uses less digits than its factorization.

18639334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331390.

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

The square root of 18639334 is about 4317.3294986600. The cubic root of 18639334 is about 265.1409431804.

The spelling of 18639334 in words is "eighteen million, six hundred thirty-nine thousand, three hundred thirty-four".