2805381 has 8 divisors (see below), whose sum is σ = 4156160. Its totient is φ = 1870236.

The previous prime is 2805371. The next prime is 2805389. The reversal of 2805381 is 1835082.

It is a happy number.

2805381 is a `hidden beast` number, since 280 + 5 + 381 = 666.

2805381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2805381 - 2¹⁴ = 2788997 is a prime.

It is a super-2 number, since 2×2805381² = 15740325110322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 103903 = 2805381 / (2 + 8 + 0 + 5 + 3 + 8 + 1).

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 (2805389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51925 + ... + 51978.

It is an arithmetic number, because the mean of its divisors is an integer number (519520).

2^2805381 is an apocalyptic number.

It is an amenable number.

2805381 is a deficient number, since it is larger than the sum of its proper divisors (1350779).

2805381 is a wasteful number, since it uses less digits than its factorization.

2805381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103912 (or 103906 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 2805381 is about 1674.9271625954. The cubic root of 2805381 is about 141.0362061842.

Subtracting from 2805381 its reverse (1835082), we obtain a cube (970299 = 99³).

The spelling of 2805381 in words is "two million, eight hundred five thousand, three hundred eighty-one".