2564399 has 4 divisors (see below), whose sum is σ = 2715264. Its totient is φ = 2413536.

The previous prime is 2564381. The next prime is 2564407. The reversal of 2564399 is 9934652.

2564399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2564399 - 2⁸ = 2564143 is a prime.

It is a super-2 number, since 2×2564399² = 13152284462402, 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 (2564329) 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, 75407 + ... + 75440.

It is an arithmetic number, because the mean of its divisors is an integer number (678816).

2^2564399 is an apocalyptic number.

2564399 is a deficient number, since it is larger than the sum of its proper divisors (150865).

2564399 is a wasteful number, since it uses less digits than its factorization.

2564399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150864.

The product of its digits is 58320, while the sum is 38.

The square root of 2564399 is about 1601.3740974551. The cubic root of 2564399 is about 136.8763869809.

The spelling of 2564399 in words is "two million, five hundred sixty-four thousand, three hundred ninety-nine".