1966559 has 8 divisors (see below), whose sum is σ = 2256000. Its totient is φ = 1679256.

The previous prime is 1966511. The next prime is 1966561. The reversal of 1966559 is 9556691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1966559 - 2⁸ = 1966303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3212 + ... + 3774.

It is an arithmetic number, because the mean of its divisors is an integer number (282000).

2^1966559 is an apocalyptic number.

1966559 is a deficient number, since it is larger than the sum of its proper divisors (289441).

1966559 is an equidigital number, since it uses as much as digits as its factorization.

1966559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069.

The product of its digits is 72900, while the sum is 41.

The square root of 1966559 is about 1402.3405435200. The cubic root of 1966559 is about 125.2859374196.

It can be divided in two parts, 19 and 66559, that multiplied together give a palindrome (1264621).

The spelling of 1966559 in words is "one million, nine hundred sixty-six thousand, five hundred fifty-nine".