1664349 has 8 divisors (see below), whose sum is σ = 2315712. Its totient is φ = 1061280.

The previous prime is 1664291. The next prime is 1664353. The reversal of 1664349 is 9434661.

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

It is not a de Polignac number, because 1664349 - 2¹⁶ = 1598813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664549) 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, 11992 + ... + 12129.

It is an arithmetic number, because the mean of its divisors is an integer number (289464).

2^1664349 is an apocalyptic number.

It is an amenable number.

1664349 is a deficient number, since it is larger than the sum of its proper divisors (651363).

1664349 is a wasteful number, since it uses less digits than its factorization.

1664349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24147.

The product of its digits is 15552, while the sum is 33.

The square root of 1664349 is about 1290.0965080179. The cubic root of 1664349 is about 118.5081267015.

The spelling of 1664349 in words is "one million, six hundred sixty-four thousand, three hundred forty-nine".