2685831 has 4 divisors (see below), whose sum is σ = 3581112. Its totient is φ = 1790552.

The previous prime is 2685827. The next prime is 2685877. The reversal of 2685831 is 1385862.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2685831 - 2² = 2685827 is a prime.

It is a super-2 number, since 2×2685831² = 14427376321122, which contains 22 as substring.

It is a D-number.

2685831 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2685792 and 2685801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2685731) 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 3 ways as a sum of consecutive naturals, for example, 447636 + ... + 447641.

It is an arithmetic number, because the mean of its divisors is an integer number (895278).

2^2685831 is an apocalyptic number.

2685831 is the 1037-th centered pentagonal number.

2685831 is a deficient number, since it is larger than the sum of its proper divisors (895281).

2685831 is an equidigital number, since it uses as much as digits as its factorization.

2685831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895280.

The product of its digits is 11520, while the sum is 33.

The square root of 2685831 is about 1638.8505117917. The cubic root of 2685831 is about 139.0036574094.

The spelling of 2685831 in words is "two million, six hundred eighty-five thousand, eight hundred thirty-one".