1645366 has 4 divisors (see below), whose sum is σ = 2468052. Its totient is φ = 822682.

The previous prime is 1645363. The next prime is 1645367. The reversal of 1645366 is 6635461.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645363) 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 as a sum of consecutive naturals, namely, 411340 + ... + 411343.

It is an arithmetic number, because the mean of its divisors is an integer number (617013).

2^1645366 is an apocalyptic number.

1645366 is a deficient number, since it is larger than the sum of its proper divisors (822686).

1645366 is an equidigital number, since it uses as much as digits as its factorization.

1645366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822685.

The product of its digits is 12960, while the sum is 31.

The square root of 1645366 is about 1282.7182075577. The cubic root of 1645366 is about 118.0558483120.

The spelling of 1645366 in words is "one million, six hundred forty-five thousand, three hundred sixty-six".