1665992 has 32 divisors (see below), whose sum is σ = 3326400. Its totient is φ = 780864.

The previous prime is 1665973. The next prime is 1665997. The reversal of 1665992 is 2995661.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1665997) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9893 + ... + 10059.

It is an arithmetic number, because the mean of its divisors is an integer number (103950).

2^1665992 is an apocalyptic number.

It is an amenable number.

1665992 is a deficient number, since it is larger than the sum of its proper divisors (1660408).

1665992 is a wasteful number, since it uses less digits than its factorization.

1665992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 241 counting only the distinct ones).

The product of its digits is 29160, while the sum is 38.

The square root of 1665992 is about 1290.7331250107. The cubic root of 1665992 is about 118.5471098748.

The spelling of 1665992 in words is "one million, six hundred sixty-five thousand, nine hundred ninety-two".