1648643 has 4 divisors (see below), whose sum is σ = 1745640. Its totient is φ = 1551648.

The previous prime is 1648613. The next prime is 1648697. The reversal of 1648643 is 3468461.

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 1648643 - 2⁶ = 1648579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1648613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48473 + ... + 48506.

It is an arithmetic number, because the mean of its divisors is an integer number (436410).

2^1648643 is an apocalyptic number.

1648643 is a deficient number, since it is larger than the sum of its proper divisors (96997).

1648643 is an equidigital number, since it uses as much as digits as its factorization.

1648643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96996.

The product of its digits is 13824, while the sum is 32.

The square root of 1648643 is about 1283.9949376847. The cubic root of 1648643 is about 118.1341718101.

The spelling of 1648643 in words is "one million, six hundred forty-eight thousand, six hundred forty-three".