2663999 has 4 divisors (see below), whose sum is σ = 2868936. Its totient is φ = 2459064.

The previous prime is 2663993. The next prime is 2664001. The reversal of 2663999 is 9993662.

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 2663999 - 2¹² = 2659903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2663993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102449 + ... + 102474.

It is an arithmetic number, because the mean of its divisors is an integer number (717234).

2^2663999 is an apocalyptic number.

2663999 is a deficient number, since it is larger than the sum of its proper divisors (204937).

2663999 is a wasteful number, since it uses less digits than its factorization.

2663999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204936.

The product of its digits is 157464, while the sum is 44.

The square root of 2663999 is about 1632.1761547088. The cubic root of 2663999 is about 138.6259980230.

The spelling of 2663999 in words is "two million, six hundred sixty-three thousand, nine hundred ninety-nine".