1664319 has 8 divisors (see below), whose sum is σ = 2229552. Its totient is φ = 1104320.

The previous prime is 1664291. The next prime is 1664353. The reversal of 1664319 is 9134661.

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 1664319 - 2⁵ = 1664287 is a prime.

It is a super-2 number, since 2×1664319² = 5539915467522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662319) 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, 492 + ... + 1889.

It is an arithmetic number, because the mean of its divisors is an integer number (278694).

2^1664319 is an apocalyptic number.

1664319 is a deficient number, since it is larger than the sum of its proper divisors (565233).

1664319 is a wasteful number, since it uses less digits than its factorization.

1664319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617.

The product of its digits is 3888, while the sum is 30.

The square root of 1664319 is about 1290.0848809284. The cubic root of 1664319 is about 118.5074146583.

The spelling of 1664319 in words is "one million, six hundred sixty-four thousand, three hundred nineteen".