18123645 has 8 divisors (see below), whose sum is σ = 28997856. Its totient is φ = 9665936.

The previous prime is 18123643. The next prime is 18123659. The reversal of 18123645 is 54632181.

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

It is a cyclic number.

It is not a de Polignac number, because 18123645 - 2¹ = 18123643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18123641) 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 7 ways as a sum of consecutive naturals, for example, 604107 + ... + 604136.

It is an arithmetic number, because the mean of its divisors is an integer number (3624732).

Almost surely, 2^18123645 is an apocalyptic number.

18123645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18123645 is a deficient number, since it is larger than the sum of its proper divisors (10874211).

18123645 is a wasteful number, since it uses less digits than its factorization.

18123645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208251.

The product of its digits is 5760, while the sum is 30.

The square root of 18123645 is about 4257.1874518278. The cubic root of 18123645 is about 262.6728476118.

The spelling of 18123645 in words is "eighteen million, one hundred twenty-three thousand, six hundred forty-five".