1664601 has 8 divisors (see below), whose sum is σ = 2230080. Its totient is φ = 1104432.

The previous prime is 1664569. The next prime is 1664627. The reversal of 1664601 is 1064661.

1664601 is nontrivially palindromic in base 4.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1664601 - 2⁵ = 1664569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1664651) 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, 525 + ... + 1898.

It is an arithmetic number, because the mean of its divisors is an integer number (278760).

2^1664601 is an apocalyptic number.

It is an amenable number.

1664601 is a deficient number, since it is larger than the sum of its proper divisors (565479).

1664601 is a wasteful number, since it uses less digits than its factorization.

1664601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2655.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1664601 is about 1290.1941714331. The cubic root of 1664601 is about 118.5141075266.

The spelling of 1664601 in words is "one million, six hundred sixty-four thousand, six hundred one".