1605223 has 4 divisors (see below), whose sum is σ = 1607760. Its totient is φ = 1602688.

The previous prime is 1605217. The next prime is 1605257. The reversal of 1605223 is 3225061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1605223 - 2⁹ = 1604711 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1605223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (401940).

2^1605223 is an apocalyptic number.

1605223 is a deficient number, since it is larger than the sum of its proper divisors (2537).

1605223 is a wasteful number, since it uses less digits than its factorization.

1605223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1605223 is about 1266.9739539549. The cubic root of 1605223 is about 117.0878391678.

The spelling of 1605223 in words is "one million, six hundred five thousand, two hundred twenty-three".