1665956 has 12 divisors (see below), whose sum is σ = 2942940. Its totient is φ = 825120.

The previous prime is 1665943. The next prime is 1665967. The reversal of 1665956 is 6595661.

It can be written as a sum of positive squares in 2 ways, for example, as 1345600 + 320356 = 1160^2 + 566^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1475 + ... + 2346.

It is an arithmetic number, because the mean of its divisors is an integer number (245245).

2^1665956 is an apocalyptic number.

It is an amenable number.

1665956 is a deficient number, since it is larger than the sum of its proper divisors (1276984).

1665956 is a wasteful number, since it uses less digits than its factorization.

1665956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934 (or 3932 counting only the distinct ones).

The product of its digits is 48600, while the sum is 38.

The square root of 1665956 is about 1290.7191793725. The cubic root of 1665956 is about 118.5462559838.

The spelling of 1665956 in words is "one million, six hundred sixty-five thousand, nine hundred fifty-six".