266402 has 4 divisors (see below), whose sum is σ = 399606. Its totient is φ = 133200.

The previous prime is 266401. The next prime is 266411. The reversal of 266402 is 204662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 203401 + 63001 = 451^2 + 251^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66599 + ... + 66602.

2²⁶⁶⁴⁰² is an apocalyptic number.

266402 is a deficient number, since it is larger than the sum of its proper divisors (133204).

266402 is a wasteful number, since it uses less digits than its factorization.

266402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133203.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 266402 is about 516.1414534796. The cubic root of 266402 is about 64.3446575202.

The spelling of 266402 in words is "two hundred sixty-six thousand, four hundred two".