1664992 has 24 divisors (see below), whose sum is σ = 3746736. Its totient is φ = 713472.

The previous prime is 1664987. The next prime is 1665007. The reversal of 1664992 is 2994661.

It is a congruent number.

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, 3493 + ... + 3940.

It is an arithmetic number, because the mean of its divisors is an integer number (156114).

2^1664992 is an apocalyptic number.

It is an amenable number.

1664992 is an abundant number, since it is smaller than the sum of its proper divisors (2081744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664992 is an equidigital number, since it uses as much as digits as its factorization.

1664992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7450 (or 7442 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 1664992 is about 1290.3456901156. The cubic root of 1664992 is about 118.5233861041.

The spelling of 1664992 in words is "one million, six hundred sixty-four thousand, nine hundred ninety-two".