26399 has 2 divisors, whose sum is σ = 26400. Its totient is φ = 26398.

The previous prime is 26393. The next prime is 26407. The reversal of 26399 is 99362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26399 - 2¹² = 22303 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13199 + 13200.

It is an arithmetic number, because the mean of its divisors is an integer number (13200).

2²⁶³⁹⁹ is an apocalyptic number.

26399 is a deficient number, since it is larger than the sum of its proper divisors (1).

26399 is an equidigital number, since it uses as much as digits as its factorization.

26399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 29.

The square root of 26399 is about 162.4776907763. The cubic root of 26399 is about 29.7757350933.

The spelling of 26399 in words is "twenty-six thousand, three hundred ninety-nine".