2168381 has 4 divisors (see below), whose sum is σ = 2175264. Its totient is φ = 2161500.

The previous prime is 2168377. The next prime is 2168399. The reversal of 2168381 is 1838612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2168381 - 2² = 2168377 is a prime.

It is a super-2 number, since 2×2168381² = 9403752322322, 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 (2168351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2945 + ... + 3606.

It is an arithmetic number, because the mean of its divisors is an integer number (543816).

2^2168381 is an apocalyptic number.

It is an amenable number.

2168381 is a deficient number, since it is larger than the sum of its proper divisors (6883).

2168381 is an equidigital number, since it uses as much as digits as its factorization.

2168381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6882.

The product of its digits is 2304, while the sum is 29.

The square root of 2168381 is about 1472.5423593228. The cubic root of 2168381 is about 129.4330537533.

The spelling of 2168381 in words is "two million, one hundred sixty-eight thousand, three hundred eighty-one".