1966505 has 4 divisors (see below), whose sum is σ = 2359812. Its totient is φ = 1573200.

The previous prime is 1966499. The next prime is 1966507. The reversal of 1966505 is 5056691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 891136 + 1075369 = 944^2 + 1037^2 .

It is not a de Polignac number, because 1966505 - 2¹² = 1962409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1966507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196646 + ... + 196655.

It is an arithmetic number, because the mean of its divisors is an integer number (589953).

2^1966505 is an apocalyptic number.

It is an amenable number.

1966505 is a deficient number, since it is larger than the sum of its proper divisors (393307).

1966505 is an equidigital number, since it uses as much as digits as its factorization.

1966505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393306.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 1966505 is about 1402.3212898619. The cubic root of 1966505 is about 125.2847906615.

The spelling of 1966505 in words is "one million, nine hundred sixty-six thousand, five hundred five".