18273868 has 24 divisors (see below), whose sum is σ = 33530112. Its totient is φ = 8697744.

The previous prime is 18273863. The next prime is 18273883. The reversal of 18273868 is 86837281.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18273863) 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, 27921 + ... + 28567.

It is an arithmetic number, because the mean of its divisors is an integer number (1397088).

Almost surely, 2^18273868 is an apocalyptic number.

It is an amenable number.

18273868 is a deficient number, since it is larger than the sum of its proper divisors (15256244).

18273868 is a wasteful number, since it uses less digits than its factorization.

18273868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 979 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 18273868 is about 4274.7944979847. The cubic root of 18273868 is about 263.3965978782.

The spelling of 18273868 in words is "eighteen million, two hundred seventy-three thousand, eight hundred sixty-eight".