8185381 has 8 divisors (see below), whose sum is σ = 8745624. Its totient is φ = 7633920.

The previous prime is 8185369. The next prime is 8185391. The reversal of 8185381 is 1835818.

8185381 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1985281 + 6200100 = 1409^2 + 2490^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 8185381 - 2⁷ = 8185253 is a prime.

It is a super-2 number, since 2×8185381² = 134000924230322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

8185381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8185301) 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 7 ways as a sum of consecutive naturals, for example, 210 + ... + 4051.

It is an arithmetic number, because the mean of its divisors is an integer number (1093203).

Almost surely, 2^8185381 is an apocalyptic number.

It is an amenable number.

8185381 is a deficient number, since it is larger than the sum of its proper divisors (560243).

8185381 is a wasteful number, since it uses less digits than its factorization.

8185381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4391.

The product of its digits is 7680, while the sum is 34.

The square root of 8185381 is about 2861.0104858249. The cubic root of 8185381 is about 201.5330602718.

The spelling of 8185381 in words is "eight million, one hundred eighty-five thousand, three hundred eighty-one".