18009123 has 8 divisors (see below), whose sum is σ = 26195136. Its totient is φ = 10914600.

The previous prime is 18009119. The next prime is 18009133. The reversal of 18009123 is 32190081.

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

It is not a de Polignac number, because 18009123 - 2² = 18009119 is a prime.

It is a super-2 number, since 2×18009123² = 648657022458258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18009093 and 18009102.

It is not an unprimeable number, because it can be changed into a prime (18009133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272833 + ... + 272898.

It is an arithmetic number, because the mean of its divisors is an integer number (3274392).

Almost surely, 2^18009123 is an apocalyptic number.

18009123 is a deficient number, since it is larger than the sum of its proper divisors (8186013).

18009123 is a wasteful number, since it uses less digits than its factorization.

18009123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545745.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 18009123 is about 4243.7157067834. The cubic root of 18009123 is about 262.1184079127.

The spelling of 18009123 in words is "eighteen million, nine thousand, one hundred twenty-three".