2581836 has 12 divisors (see below), whose sum is σ = 6024312. Its totient is φ = 860608.

The previous prime is 2581829. The next prime is 2581837. The reversal of 2581836 is 6381852.

It is a happy number.

2581836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2581797 and 2581806.

It is not an unprimeable number, because it can be changed into a prime (2581837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107565 + ... + 107588.

It is an arithmetic number, because the mean of its divisors is an integer number (502026).

2^2581836 is an apocalyptic number.

It is an amenable number.

2581836 is an abundant number, since it is smaller than the sum of its proper divisors (3442476).

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

2581836 is a wasteful number, since it uses less digits than its factorization.

2581836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215160 (or 215158 counting only the distinct ones).

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

The square root of 2581836 is about 1606.8092606156. The cubic root of 2581836 is about 137.1859233547.

The spelling of 2581836 in words is "two million, five hundred eighty-one thousand, eight hundred thirty-six".