2560989 has 4 divisors (see below), whose sum is σ = 3414656. Its totient is φ = 1707324.

The previous prime is 2560979. The next prime is 2560993. The reversal of 2560989 is 9890652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2560989 - 2⁴ = 2560973 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2560939) 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, 426829 + ... + 426834.

It is an arithmetic number, because the mean of its divisors is an integer number (853664).

2^2560989 is an apocalyptic number.

It is an amenable number.

2560989 is a deficient number, since it is larger than the sum of its proper divisors (853667).

2560989 is an equidigital number, since it uses as much as digits as its factorization.

2560989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853666.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 2560989 is about 1600.3090326559. The cubic root of 2560989 is about 136.8156897808.

The spelling of 2560989 in words is "two million, five hundred sixty thousand, nine hundred eighty-nine".