26397999 has 12 divisors (see below), whose sum is σ = 38313912. Its totient is φ = 17514000.

The previous prime is 26397989. The next prime is 26398003. The reversal of 26397999 is 99979362.

It is not a de Polignac number, because 26397999 - 2¹⁵ = 26365231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26397949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5052 + ... + 8849.

It is an arithmetic number, because the mean of its divisors is an integer number (3192826).

Almost surely, 2^26397999 is an apocalyptic number.

26397999 is a deficient number, since it is larger than the sum of its proper divisors (11915913).

26397999 is a wasteful number, since it uses less digits than its factorization.

26397999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14118 (or 14115 counting only the distinct ones).

The product of its digits is 1653372, while the sum is 54.

The square root of 26397999 is about 5137.8983057277. The cubic root of 26397999 is about 297.7535874211.

The spelling of 26397999 in words is "twenty-six million, three hundred ninety-seven thousand, nine hundred ninety-nine".