2305881 has 16 divisors (see below), whose sum is σ = 3501120. Its totient is φ = 1499040.

The previous prime is 2305837. The next prime is 2305883. The reversal of 2305881 is 1885032.

It is a happy number.

It is not a de Polignac number, because 2305881 - 2⁷ = 2305753 is a prime.

It is a super-2 number, since 2×2305881² = 10634174372322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2305883) 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, 66 + ... + 2148.

It is an arithmetic number, because the mean of its divisors is an integer number (218820).

2^2305881 is an apocalyptic number.

It is an amenable number.

2305881 is a deficient number, since it is larger than the sum of its proper divisors (1195239).

2305881 is a wasteful number, since it uses less digits than its factorization.

2305881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133 (or 2127 counting only the distinct ones).

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

The square root of 2305881 is about 1518.5127592483. The cubic root of 2305881 is about 132.1130230328.

The spelling of 2305881 in words is "two million, three hundred five thousand, eight hundred eighty-one".