1605266 has 16 divisors (see below), whose sum is σ = 2683800. Its totient is φ = 715008.

The previous prime is 1605257. The next prime is 1605269. The reversal of 1605266 is 6625061.

It can be written as a sum of positive squares in 4 ways, for example, as 931225 + 674041 = 965^2 + 821^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1605269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311 + ... + 1818.

2^1605266 is an apocalyptic number.

1605266 is a deficient number, since it is larger than the sum of its proper divisors (1078534).

1605266 is a wasteful number, since it uses less digits than its factorization.

1605266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1605266 is about 1266.9909234087. The cubic root of 1605266 is about 117.0888846575.

The spelling of 1605266 in words is "one million, six hundred five thousand, two hundred sixty-six".