1331966 has 4 divisors (see below), whose sum is σ = 1997952. Its totient is φ = 665982.

The previous prime is 1331959. The next prime is 1331969. The reversal of 1331966 is 6691331.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332990 + ... + 332993.

It is an arithmetic number, because the mean of its divisors is an integer number (499488).

2^1331966 is an apocalyptic number.

1331966 is a deficient number, since it is larger than the sum of its proper divisors (665986).

1331966 is an equidigital number, since it uses as much as digits as its factorization.

1331966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665985.

The product of its digits is 2916, while the sum is 29.

The square root of 1331966 is about 1154.1083138077. The cubic root of 1331966 is about 110.0266051349.

The spelling of 1331966 in words is "one million, three hundred thirty-one thousand, nine hundred sixty-six".