13265999 has 4 divisors (see below), whose sum is σ = 13278936. Its totient is φ = 13253064.

The previous prime is 13265981. The next prime is 13266007. The reversal of 13265999 is 99956231.

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 13265999 - 2¹⁶ = 13200463 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 (13265929) 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, 4784 + ... + 7029.

It is an arithmetic number, because the mean of its divisors is an integer number (3319734).

Almost surely, 2^13265999 is an apocalyptic number.

13265999 is a deficient number, since it is larger than the sum of its proper divisors (12937).

13265999 is a wasteful number, since it uses less digits than its factorization.

13265999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12936.

The product of its digits is 131220, while the sum is 44.

The square root of 13265999 is about 3642.2519133086. The cubic root of 13265999 is about 236.7263780653.

The spelling of 13265999 in words is "thirteen million, two hundred sixty-five thousand, nine hundred ninety-nine".