1664075 has 24 divisors (see below), whose sum is σ = 2431392. Its totient is φ = 1105920.

The previous prime is 1664071. The next prime is 1664083. The reversal of 1664075 is 5704661.

It is not a de Polignac number, because 1664075 - 2² = 1664071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6347 + ... + 6603.

It is an arithmetic number, because the mean of its divisors is an integer number (101308).

2^1664075 is an apocalyptic number.

1664075 is a deficient number, since it is larger than the sum of its proper divisors (767317).

1664075 is a wasteful number, since it uses less digits than its factorization.

1664075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1664075 is about 1289.9903100411. The cubic root of 1664075 is about 118.5016230557.

The spelling of 1664075 in words is "one million, six hundred sixty-four thousand, seventy-five".