1664947 has 8 divisors (see below), whose sum is σ = 1751040. Its totient is φ = 1580040.

The previous prime is 1664941. The next prime is 1664959. The reversal of 1664947 is 7494661.

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

It is a cyclic number.

It is not a de Polignac number, because 1664947 - 2¹⁵ = 1632179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664941) 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 7 ways as a sum of consecutive naturals, for example, 4204 + ... + 4582.

It is an arithmetic number, because the mean of its divisors is an integer number (218880).

2^1664947 is an apocalyptic number.

1664947 is a deficient number, since it is larger than the sum of its proper divisors (86093).

1664947 is a wasteful number, since it uses less digits than its factorization.

1664947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593.

The product of its digits is 36288, while the sum is 37.

The square root of 1664947 is about 1290.3282528101. The cubic root of 1664947 is about 118.5223183111.

The spelling of 1664947 in words is "one million, six hundred sixty-four thousand, nine hundred forty-seven".