1966369 has 4 divisors (see below), whose sum is σ = 1985940. Its totient is φ = 1946800.

The previous prime is 1966343. The next prime is 1966381. The reversal of 1966369 is 9636691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9636691 = 31 ⋅310861.

It can be written as a sum of positive squares in 2 ways, for example, as 1411344 + 555025 = 1188^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966369 - 2⁵ = 1966337 is a prime.

It is a super-2 number, since 2×1966369² = 7733214088322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9634 + ... + 9835.

It is an arithmetic number, because the mean of its divisors is an integer number (496485).

2^1966369 is an apocalyptic number.

It is an amenable number.

1966369 is a deficient number, since it is larger than the sum of its proper divisors (19571).

1966369 is a wasteful number, since it uses less digits than its factorization.

1966369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19570.

The product of its digits is 52488, while the sum is 40.

The square root of 1966369 is about 1402.2727979962. The cubic root of 1966369 is about 125.2819024369.

The spelling of 1966369 in words is "one million, nine hundred sixty-six thousand, three hundred sixty-nine".