1643268 has 48 divisors (see below), whose sum is σ = 4273920. Its totient is φ = 487200.

The previous prime is 1643251. The next prime is 1643269. The reversal of 1643268 is 8623461.

It is a d-powerful number, because it can be written as 1 + 6³ + 4² + 3¹³ + 2¹¹ + 6⁶ + 8 .

Its product of digits (6912) is a multiple of the sum of its prime factors (288).

It is not an unprimeable number, because it can be changed into a prime (1643269) 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 15 ways as a sum of consecutive naturals, for example, 7683 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (89040).

2^1643268 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1643268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2136960).

1643268 is an abundant number, since it is smaller than the sum of its proper divisors (2630652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1643268 is a wasteful number, since it uses less digits than its factorization.

1643268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288 (or 286 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 1643268 is about 1281.9001521179. The cubic root of 1643268 is about 118.0056494470.

The spelling of 1643268 in words is "one million, six hundred forty-three thousand, two hundred sixty-eight".