2581906 has 8 divisors (see below), whose sum is σ = 3884364. Its totient is φ = 1287120.

The previous prime is 2581877. The next prime is 2581907. The reversal of 2581906 is 6091852.

2581906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2531281 + 50625 = 1591^2 + 225^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2581907) 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, 985 + ... + 2476.

2^2581906 is an apocalyptic number.

2581906 is a deficient number, since it is larger than the sum of its proper divisors (1302458).

2581906 is a wasteful number, since it uses less digits than its factorization.

2581906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2581906 is about 1606.8310427671. The cubic root of 2581906 is about 137.1871631608.

The spelling of 2581906 in words is "two million, five hundred eighty-one thousand, nine hundred six".