18001093 has 4 divisors (see below), whose sum is σ = 19637568. Its totient is φ = 16364620.

The previous prime is 18001073. The next prime is 18001099. The reversal of 18001093 is 39010081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39010081 = 11 ⋅3546371.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18001093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18001099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 818221 + ... + 818242.

It is an arithmetic number, because the mean of its divisors is an integer number (4909392).

Almost surely, 2^18001093 is an apocalyptic number.

It is an amenable number.

18001093 is a deficient number, since it is larger than the sum of its proper divisors (1636475).

18001093 is a wasteful number, since it uses less digits than its factorization.

18001093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636474.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 18001093 is about 4242.7694964492. The cubic root of 18001093 is about 262.0794438882.

The spelling of 18001093 in words is "eighteen million, one thousand, ninety-three".