266399 has 8 divisors (see below), whose sum is σ = 320640. Its totient is φ = 216216.

The previous prime is 266381. The next prime is 266401. The reversal of 266399 is 993662.

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

It is not a de Polignac number, because 266399 - 2¹² = 262303 is a prime.

It is a Duffinian number.

266399 is a modest number, since divided by 399 gives 266 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266359) 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, 869 + ... + 1134.

It is an arithmetic number, because the mean of its divisors is an integer number (40080).

2²⁶⁶³⁹⁹ is an apocalyptic number.

266399 is a deficient number, since it is larger than the sum of its proper divisors (54241).

266399 is a wasteful number, since it uses less digits than its factorization.

266399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029.

The product of its digits is 17496, while the sum is 35.

The square root of 266399 is about 516.1385472913. The cubic root of 266399 is about 64.3444159871.

The spelling of 266399 in words is "two hundred sixty-six thousand, three hundred ninety-nine".