405266 has 8 divisors (see below), whose sum is σ = 614460. Its totient is φ = 200448.

The previous prime is 405253. The next prime is 405269. The reversal of 405266 is 662504.

It can be written as a sum of positive squares in 2 ways, for example, as 390625 + 14641 = 625^2 + 121^2 .

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

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (405269) by changing a digit.

405266 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851 + ... + 1238.

2⁴⁰⁵²⁶⁶ is an apocalyptic number.

405266 is a deficient number, since it is larger than the sum of its proper divisors (209194).

405266 is a wasteful number, since it uses less digits than its factorization.

405266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 405266 is about 636.6050581012. The cubic root of 405266 is about 74.0025565223.

The spelling of 405266 in words is "four hundred five thousand, two hundred sixty-six".