18868331 has 4 divisors (see below), whose sum is σ = 18887664. Its totient is φ = 18849000.

The previous prime is 18868309. The next prime is 18868361. The reversal of 18868331 is 13386881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13386881 = 1567 ⋅8543.

It is a cyclic number.

It is not a de Polignac number, because 18868331 - 2¹⁰ = 18867307 is a prime.

It is a super-2 number, since 2×18868331² = 712027829451122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18868301) 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, 8120 + ... + 10181.

It is an arithmetic number, because the mean of its divisors is an integer number (4721916).

Almost surely, 2^18868331 is an apocalyptic number.

18868331 is a deficient number, since it is larger than the sum of its proper divisors (19333).

18868331 is a wasteful number, since it uses less digits than its factorization.

18868331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19332.

The product of its digits is 27648, while the sum is 38.

The square root of 18868331 is about 4343.7692157848. The cubic root of 18868331 is about 266.2223394013. Note that the first 3 decimals are identical.

The spelling of 18868331 in words is "eighteen million, eight hundred sixty-eight thousand, three hundred thirty-one".