2589781 has 4 divisors (see below), whose sum is σ = 2593612. Its totient is φ = 2585952.

The previous prime is 2589779. The next prime is 2589791. The reversal of 2589781 is 1879852.

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 2146225 + 443556 = 1465^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 2589781 - 2¹ = 2589779 is a prime.

It is a super-2 number, since 2×2589781² = 13413931255922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2589701) 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, 600 + ... + 2353.

It is an arithmetic number, because the mean of its divisors is an integer number (648403).

2^2589781 is an apocalyptic number.

It is an amenable number.

2589781 is a deficient number, since it is larger than the sum of its proper divisors (3831).

2589781 is an equidigital number, since it uses as much as digits as its factorization.

2589781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3830.

The product of its digits is 40320, while the sum is 40.

The square root of 2589781 is about 1609.2796525154. The cubic root of 2589781 is about 137.3264985183.

The spelling of 2589781 in words is "two million, five hundred eighty-nine thousand, seven hundred eighty-one".