18282381 has 16 divisors (see below), whose sum is σ = 26330304. Its totient is φ = 11217024.

The previous prime is 18282379. The next prime is 18282391. The reversal of 18282381 is 18328281.

It is not a de Polignac number, because 18282381 - 2¹ = 18282379 is a prime.

It is a super-2 number, since 2×18282381² = 668490910058322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18282301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20905 + ... + 21761.

It is an arithmetic number, because the mean of its divisors is an integer number (1645644).

Almost surely, 2^18282381 is an apocalyptic number.

It is an amenable number.

18282381 is a deficient number, since it is larger than the sum of its proper divisors (8047923).

18282381 is a wasteful number, since it uses less digits than its factorization.

18282381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420.

The product of its digits is 6144, while the sum is 33.

The square root of 18282381 is about 4275.7901024255. The cubic root of 18282381 is about 263.4374931999.

The spelling of 18282381 in words is "eighteen million, two hundred eighty-two thousand, three hundred eighty-one".