18863381 has 8 divisors (see below), whose sum is σ = 19978944. Its totient is φ = 17772480.

The previous prime is 18863357. The next prime is 18863399. The reversal of 18863381 is 18336881.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18863381 is a prime.

It is a super-2 number, since 2×18863381² = 711654285502322, 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 (18863681) 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, 4580 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (2497368).

Almost surely, 2^18863381 is an apocalyptic number.

It is an amenable number.

18863381 is a deficient number, since it is larger than the sum of its proper divisors (1115563).

18863381 is a wasteful number, since it uses less digits than its factorization.

18863381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12331.

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

The square root of 18863381 is about 4343.1993967581. The cubic root of 18863381 is about 266.1990567231.

The spelling of 18863381 in words is "eighteen million, eight hundred sixty-three thousand, three hundred eighty-one".