2091868 has 12 divisors (see below), whose sum is σ = 3685192. Its totient is φ = 1038960.

The previous prime is 2091863. The next prime is 2091871. The reversal of 2091868 is 8681902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091863) 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, 1038 + ... + 2293.

2^2091868 is an apocalyptic number.

It is an amenable number.

2091868 is a deficient number, since it is larger than the sum of its proper divisors (1593324).

2091868 is a wasteful number, since it uses less digits than its factorization.

2091868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492 (or 3490 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 2091868 is about 1446.3291464947. The cubic root of 2091868 is about 127.8924063295.

Adding to 2091868 its sum of digits (34), we get a palindrome (2091902).

The spelling of 2091868 in words is "two million, ninety-one thousand, eight hundred sixty-eight".