2684861 has 4 divisors (see below), whose sum is σ = 2842812. Its totient is φ = 2526912.

The previous prime is 2684837. The next prime is 2684881. The reversal of 2684861 is 1684862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2464900 + 219961 = 1570^2 + 469^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2684861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2684881) 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, 78950 + ... + 78983.

It is an arithmetic number, because the mean of its divisors is an integer number (710703).

2^2684861 is an apocalyptic number.

It is an amenable number.

2684861 is a deficient number, since it is larger than the sum of its proper divisors (157951).

2684861 is a wasteful number, since it uses less digits than its factorization.

2684861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157950.

The product of its digits is 18432, while the sum is 35.

The square root of 2684861 is about 1638.5545459337. The cubic root of 2684861 is about 138.9869214615.

Subtracting from 2684861 its reverse (1684862), we obtain a palindrome (999999).

The spelling of 2684861 in words is "two million, six hundred eighty-four thousand, eight hundred sixty-one".