18258381 has 12 divisors (see below), whose sum is σ = 26451360. Its totient is φ = 12136200.

The previous prime is 18258377. The next prime is 18258403. The reversal of 18258381 is 18385281.

It is not a de Polignac number, because 18258381 - 2² = 18258377 is a prime.

It is a super-2 number, since 2×18258381² = 666736953482322, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18258301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 406 + ... + 6056.

It is an arithmetic number, because the mean of its divisors is an integer number (2204280).

Almost surely, 2^18258381 is an apocalyptic number.

It is an amenable number.

18258381 is a deficient number, since it is larger than the sum of its proper divisors (8192979).

18258381 is a wasteful number, since it uses less digits than its factorization.

18258381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016 (or 6013 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 18258381 is about 4272.9826819214. The cubic root of 18258381 is about 263.3221678045.

The spelling of 18258381 in words is "eighteen million, two hundred fifty-eight thousand, three hundred eighty-one".