1664968 has 8 divisors (see below), whose sum is σ = 3121830. Its totient is φ = 832480.

The previous prime is 1664959. The next prime is 1664987. The reversal of 1664968 is 8694661.

It can be written as a sum of positive squares in only one way, i.e., 1633284 + 31684 = 1278^2 + 178^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 1664968.

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 as a sum of consecutive naturals, namely, 104053 + ... + 104068.

2^1664968 is an apocalyptic number.

It is an amenable number.

1664968 is a deficient number, since it is larger than the sum of its proper divisors (1456862).

1664968 is a wasteful number, since it uses less digits than its factorization.

1664968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208127 (or 208123 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 1664968 is about 1290.3363902487. The cubic root of 1664968 is about 118.5228166169.

The spelling of 1664968 in words is "one million, six hundred sixty-four thousand, nine hundred sixty-eight".