18133915 has 8 divisors (see below), whose sum is σ = 22462848. Its totient is φ = 14039040.

The previous prime is 18133909. The next prime is 18133919. The reversal of 18133915 is 51933181.

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

It is not a de Polignac number, because 18133915 - 2¹⁵ = 18101147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (18133919) 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, 58342 + ... + 58651.

It is an arithmetic number, because the mean of its divisors is an integer number (2807856).

Almost surely, 2^18133915 is an apocalyptic number.

18133915 is a deficient number, since it is larger than the sum of its proper divisors (4328933).

18133915 is a wasteful number, since it uses less digits than its factorization.

18133915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117029.

The product of its digits is 3240, while the sum is 31.

The square root of 18133915 is about 4258.3934764181. The cubic root of 18133915 is about 262.7224539089.

The spelling of 18133915 in words is "eighteen million, one hundred thirty-three thousand, nine hundred fifteen".