1664201 has 8 divisors (see below), whose sum is σ = 2074944. Its totient is φ = 1296720.

The previous prime is 1664123. The next prime is 1664227. The reversal of 1664201 is 1024661.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10730 + ... + 10883.

It is an arithmetic number, because the mean of its divisors is an integer number (259368).

2^1664201 is an apocalyptic number.

1664201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1664201 is a deficient number, since it is larger than the sum of its proper divisors (410743).

1664201 is a wasteful number, since it uses less digits than its factorization.

1664201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21631.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1664201 is about 1290.0391466928. The cubic root of 1664201 is about 118.5046138720.

Adding to 1664201 its reverse (1024661), we get a palindrome (2688862).

The spelling of 1664201 in words is "one million, six hundred sixty-four thousand, two hundred one".