1966886 has 4 divisors (see below), whose sum is σ = 2950332. Its totient is φ = 983442.

The previous prime is 1966879. The next prime is 1966889. The reversal of 1966886 is 6886691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6886691 = 7 ⋅983813.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 491720 + ... + 491723.

It is an arithmetic number, because the mean of its divisors is an integer number (737583).

2^1966886 is an apocalyptic number.

1966886 is a deficient number, since it is larger than the sum of its proper divisors (983446).

1966886 is an equidigital number, since it uses as much as digits as its factorization.

1966886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983445.

The product of its digits is 124416, while the sum is 44.

The square root of 1966886 is about 1402.4571294696. The cubic root of 1966886 is about 125.2928812287.

The spelling of 1966886 in words is "one million, nine hundred sixty-six thousand, eight hundred eighty-six".