1664265 has 8 divisors (see below), whose sum is σ = 2662848. Its totient is φ = 887600.

The previous prime is 1664261. The next prime is 1664279. The reversal of 1664265 is 5624661.

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

It is not a de Polignac number, because 1664265 - 2² = 1664261 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1664261) 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, 55461 + ... + 55490.

It is an arithmetic number, because the mean of its divisors is an integer number (332856).

2^1664265 is an apocalyptic number.

1664265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1664265 is a deficient number, since it is larger than the sum of its proper divisors (998583).

1664265 is a wasteful number, since it uses less digits than its factorization.

1664265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110959.

The product of its digits is 8640, while the sum is 30.

The square root of 1664265 is about 1290.0639519032. The cubic root of 1664265 is about 118.5061329589.

The spelling of 1664265 in words is "one million, six hundred sixty-four thousand, two hundred sixty-five".