2561886 has 12 divisors (see below), whose sum is σ = 5550792. Its totient is φ = 853956.

The previous prime is 2561873. The next prime is 2561899. The reversal of 2561886 is 6881652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2561873) and next prime (2561899).

It is a self number, because there is not a number n which added to its sum of digits gives 2561886.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 71146 + ... + 71181.

It is an arithmetic number, because the mean of its divisors is an integer number (462566).

2^2561886 is an apocalyptic number.

2561886 is an abundant number, since it is smaller than the sum of its proper divisors (2988906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561886 is a wasteful number, since it uses less digits than its factorization.

2561886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142335 (or 142332 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2561886 is about 1600.5892664891. The cubic root of 2561886 is about 136.8316613902.

The spelling of 2561886 in words is "two million, five hundred sixty-one thousand, eight hundred eighty-six".