1985966 has 4 divisors (see below), whose sum is σ = 2978952. Its totient is φ = 992982.

The previous prime is 1985939. The next prime is 1985987. The reversal of 1985966 is 6695891.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496490 + ... + 496493.

It is an arithmetic number, because the mean of its divisors is an integer number (744738).

2^1985966 is an apocalyptic number.

1985966 is a deficient number, since it is larger than the sum of its proper divisors (992986).

1985966 is an equidigital number, since it uses as much as digits as its factorization.

1985966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992985.

The product of its digits is 116640, while the sum is 44.

The square root of 1985966 is about 1409.2430592343. The cubic root of 1985966 is about 125.6967174633.

The spelling of 1985966 in words is "one million, nine hundred eighty-five thousand, nine hundred sixty-six".