2685891 has 16 divisors (see below), whose sum is σ = 3923360. Its totient is φ = 1624320.

The previous prime is 2685887. The next prime is 2685901. The reversal of 2685891 is 1985862.

It is not a de Polignac number, because 2685891 - 2² = 2685887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2685191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1815 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (245210).

2^2685891 is an apocalyptic number.

2685891 is a deficient number, since it is larger than the sum of its proper divisors (1237469).

2685891 is a wasteful number, since it uses less digits than its factorization.

2685891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206.

The product of its digits is 34560, while the sum is 39.

The square root of 2685891 is about 1638.8688172029. The cubic root of 2685891 is about 139.0046924903.

The spelling of 2685891 in words is "two million, six hundred eighty-five thousand, eight hundred ninety-one".