18063893 has 4 divisors (see below), whose sum is σ = 18072768. Its totient is φ = 18055020.

The previous prime is 18063887. The next prime is 18063907. The reversal of 18063893 is 39836081.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39836081 = 157 ⋅253733.

It is a cyclic number.

It is not a de Polignac number, because 18063893 - 2²² = 13869589 is a prime.

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 (18063833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308 + ... + 6018.

It is an arithmetic number, because the mean of its divisors is an integer number (4518192).

Almost surely, 2^18063893 is an apocalyptic number.

It is an amenable number.

18063893 is a deficient number, since it is larger than the sum of its proper divisors (8875).

18063893 is an equidigital number, since it uses as much as digits as its factorization.

18063893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8874.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18063893 is about 4250.1638791934. The cubic root of 18063893 is about 262.3838603389.

The spelling of 18063893 in words is "eighteen million, sixty-three thousand, eight hundred ninety-three".