1664862 has 16 divisors (see below), whose sum is σ = 3386880. Its totient is φ = 545432.

The previous prime is 1664857. The next prime is 1664863. The reversal of 1664862 is 2684661.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664863) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1998 + ... + 2705.

It is an arithmetic number, because the mean of its divisors is an integer number (211680).

2^1664862 is an apocalyptic number.

1664862 is an abundant number, since it is smaller than the sum of its proper divisors (1722018).

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

1664862 is a wasteful number, since it uses less digits than its factorization.

1664862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4767.

The product of its digits is 13824, while the sum is 33.

The square root of 1664862 is about 1290.2953150345. The cubic root of 1664862 is about 118.5203013163.

The spelling of 1664862 in words is "one million, six hundred sixty-four thousand, eight hundred sixty-two".