2289861 has 24 divisors (see below), whose sum is σ = 3981120. Its totient is φ = 1238976.

The previous prime is 2289841. The next prime is 2289863. The reversal of 2289861 is 1689822.

It is not a de Polignac number, because 2289861 - 2⁵ = 2289829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2289863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241 + ... + 2153.

It is an arithmetic number, because the mean of its divisors is an integer number (165880).

2^2289861 is an apocalyptic number.

2289861 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2289861 is a deficient number, since it is larger than the sum of its proper divisors (1691259).

2289861 is a wasteful number, since it uses less digits than its factorization.

2289861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945 (or 1942 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 2289861 is about 1513.2286674525. The cubic root of 2289861 is about 131.8063620865.

The spelling of 2289861 in words is "two million, two hundred eighty-nine thousand, eight hundred sixty-one".