1664363 has 4 divisors (see below), whose sum is σ = 1670568. Its totient is φ = 1658160.

The previous prime is 1664353. The next prime is 1664387. The reversal of 1664363 is 3634661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1664363 - 2¹⁶ = 1598827 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 2681 + ... + 3242.

It is an arithmetic number, because the mean of its divisors is an integer number (417642).

2^1664363 is an apocalyptic number.

1664363 is a deficient number, since it is larger than the sum of its proper divisors (6205).

1664363 is an equidigital number, since it uses as much as digits as its factorization.

1664363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6204.

The product of its digits is 7776, while the sum is 29.

The square root of 1664363 is about 1290.1019339572. The cubic root of 1664363 is about 118.5084589854.

The spelling of 1664363 in words is "one million, six hundred sixty-four thousand, three hundred sixty-three".