2564989 has 8 divisors (see below), whose sum is σ = 2979968. Its totient is φ = 2162160.

The previous prime is 2564957. The next prime is 2564999. The reversal of 2564989 is 9894652.

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

It is not a de Polignac number, because 2564989 - 2⁵ = 2564957 is a prime.

It is a Duffinian number.

2564989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564999) 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 7 ways as a sum of consecutive naturals, for example, 2577 + ... + 3430.

It is an arithmetic number, because the mean of its divisors is an integer number (372496).

2^2564989 is an apocalyptic number.

It is an amenable number.

2564989 is a deficient number, since it is larger than the sum of its proper divisors (414979).

2564989 is an equidigital number, since it uses as much as digits as its factorization.

2564989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6075.

The product of its digits is 155520, while the sum is 43.

The square root of 2564989 is about 1601.5583036530. The cubic root of 2564989 is about 136.8868833813.

It can be divided in two parts, 2564 and 989, that added together give a palindrome (3553).

The spelling of 2564989 in words is "two million, five hundred sixty-four thousand, nine hundred eighty-nine".