1664343 has 12 divisors (see below), whose sum is σ = 2530840. Its totient is φ = 1051056.

The previous prime is 1664291. The next prime is 1664353. The reversal of 1664343 is 3434661.

1664343 is a `hidden beast` number, since 16 + 643 + 4 + 3 = 666.

It is not a de Polignac number, because 1664343 - 2⁶ = 1664279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4696 + ... + 5037.

2^1664343 is an apocalyptic number.

1664343 is a deficient number, since it is larger than the sum of its proper divisors (866497).

1664343 is a wasteful number, since it uses less digits than its factorization.

1664343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9758 (or 9755 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 1664343 is about 1290.0941826084. The cubic root of 1664343 is about 118.5079842935.

The spelling of 1664343 in words is "one million, six hundred sixty-four thousand, three hundred forty-three".