7818381 has 12 divisors (see below), whose sum is σ = 11320608. Its totient is φ = 5199624.

The previous prime is 7818379. The next prime is 7818397. The reversal of 7818381 is 1838187.

7818381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7818381 - 2¹ = 7818379 is a prime.

It is a super-2 number, since 2×7818381² = 122254162922322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7818311) 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, 4296 + ... + 5838.

It is an arithmetic number, because the mean of its divisors is an integer number (943384).

Almost surely, 2^7818381 is an apocalyptic number.

It is an amenable number.

7818381 is a deficient number, since it is larger than the sum of its proper divisors (3502227).

7818381 is a wasteful number, since it uses less digits than its factorization.

7818381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112 (or 2109 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 7818381 is about 2796.1367992285. The cubic root of 7818381 is about 198.4749083711.

The spelling of 7818381 in words is "seven million, eight hundred eighteen thousand, three hundred eighty-one".