1664253 has 16 divisors (see below), whose sum is σ = 2514240. Its totient is φ = 1087632.

The previous prime is 1664251. The next prime is 1664261. The reversal of 1664253 is 3524661.

1664253 is a `hidden beast` number, since 16 + 642 + 5 + 3 = 666.

It is not a de Polignac number, because 1664253 - 2¹ = 1664251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 850 + ... + 2012.

It is an arithmetic number, because the mean of its divisors is an integer number (157140).

2^1664253 is an apocalyptic number.

It is an amenable number.

1664253 is a deficient number, since it is larger than the sum of its proper divisors (849987).

1664253 is a wasteful number, since it uses less digits than its factorization.

1664253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225 (or 1219 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1664253 is about 1290.0593009626. The cubic root of 1664253 is about 118.5058481331.

The spelling of 1664253 in words is "one million, six hundred sixty-four thousand, two hundred fifty-three".