2664399 has 4 divisors (see below), whose sum is σ = 3552536. Its totient is φ = 1776264.

The previous prime is 2664397. The next prime is 2664401. The reversal of 2664399 is 9934662.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (2664397) and next prime (2664401).

It is not a de Polignac number, because 2664399 - 2¹ = 2664397 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 6⁷ + 6⁷ + 4 + 3⁸ + 9² + 9³ .

It is a D-number.

It is a Duffinian number.

2664399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2664397) 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, 444064 + ... + 444069.

It is an arithmetic number, because the mean of its divisors is an integer number (888134).

2^2664399 is an apocalyptic number.

2664399 is a deficient number, since it is larger than the sum of its proper divisors (888137).

2664399 is an equidigital number, since it uses as much as digits as its factorization.

2664399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888136.

The product of its digits is 69984, while the sum is 39.

The square root of 2664399 is about 1632.2986859028. The cubic root of 2664399 is about 138.6329359165.

The spelling of 2664399 in words is "two million, six hundred sixty-four thousand, three hundred ninety-nine".