2666399 has 8 divisors (see below), whose sum is σ = 2866608. Its totient is φ = 2471040.

The previous prime is 2666393. The next prime is 2666423. The reversal of 2666399 is 9936662.

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

It is a cyclic number.

It is not a de Polignac number, because 2666399 - 2⁴ = 2666383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32 + ... + 2309.

It is an arithmetic number, because the mean of its divisors is an integer number (358326).

2^2666399 is an apocalyptic number.

2666399 is a deficient number, since it is larger than the sum of its proper divisors (200209).

2666399 is a wasteful number, since it uses less digits than its factorization.

2666399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425.

The product of its digits is 104976, while the sum is 41.

The square root of 2666399 is about 1632.9112039545. The cubic root of 2666399 is about 138.6676149724.

It can be divided in two parts, 26663 and 99, that added together give a palindrome (26762).

The spelling of 2666399 in words is "two million, six hundred sixty-six thousand, three hundred ninety-nine".