1664545 has 8 divisors (see below), whose sum is σ = 2062080. Its totient is φ = 1288560.

The previous prime is 1664543. The next prime is 1664549. The reversal of 1664545 is 5454661.

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

It is not a de Polignac number, because 1664545 - 2¹ = 1664543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (1664543) 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, 5215 + ... + 5524.

It is an arithmetic number, because the mean of its divisors is an integer number (257760).

2^1664545 is an apocalyptic number.

It is an amenable number.

1664545 is a deficient number, since it is larger than the sum of its proper divisors (397535).

1664545 is a wasteful number, since it uses less digits than its factorization.

1664545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10775.

The product of its digits is 14400, while the sum is 31.

The square root of 1664545 is about 1290.1724690909. The cubic root of 1664545 is about 118.5127785065.

It can be divided in two parts, 1664 and 545, that added together give a square (2209 = 47²).

The spelling of 1664545 in words is "one million, six hundred sixty-four thousand, five hundred forty-five".