266426 has 4 divisors (see below), whose sum is σ = 399642. Its totient is φ = 133212.

The previous prime is 266417. The next prime is 266447. The reversal of 266426 is 624662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 624662 = 2 ⋅312331.

It can be written as a sum of positive squares in only one way, i.e., 160801 + 105625 = 401^2 + 325^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 266395 and 266404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66605 + ... + 66608.

2²⁶⁶⁴²⁶ is an apocalyptic number.

266426 is a deficient number, since it is larger than the sum of its proper divisors (133216).

266426 is a wasteful number, since it uses less digits than its factorization.

266426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133215.

The product of its digits is 3456, while the sum is 26.

The square root of 266426 is about 516.1647023964. The cubic root of 266426 is about 64.3465897196.

The spelling of 266426 in words is "two hundred sixty-six thousand, four hundred twenty-six".