18215093 has 8 divisors (see below), whose sum is σ = 19987128. Its totient is φ = 16496064.

The previous prime is 18215083. The next prime is 18215159. The reversal of 18215093 is 39051281.

It can be written as a sum of positive squares in 4 ways, for example, as 4092529 + 14122564 = 2023^2 + 3758^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-18215093 is a prime.

It is a super-2 number, since 2×18215093² = 663579225997298, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18215003) 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, 12530 + ... + 13907.

It is an arithmetic number, because the mean of its divisors is an integer number (2498391).

Almost surely, 2^18215093 is an apocalyptic number.

18215093 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18215093 is a deficient number, since it is larger than the sum of its proper divisors (1772035).

18215093 is a wasteful number, since it uses less digits than its factorization.

18215093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26503.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 18215093 is about 4267.9143618400. The cubic root of 18215093 is about 263.1139034444.

The spelling of 18215093 in words is "eighteen million, two hundred fifteen thousand, ninety-three".