1643472 has 60 divisors (see below), whose sum is σ = 4686084. Its totient is φ = 537600.

The previous prime is 1643461. The next prime is 1643491. The reversal of 1643472 is 2743461.

It can be written as a sum of positive squares in 2 ways, for example, as 767376 + 876096 = 876^2 + 936^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14488 + ... + 14600.

2^1643472 is an apocalyptic number.

1643472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1643472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2343042).

1643472 is an abundant number, since it is smaller than the sum of its proper divisors (3042612).

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

1643472 is a wasteful number, since it uses less digits than its factorization.

1643472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 219 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 1643472 is about 1281.9797190283. The cubic root of 1643472 is about 118.0105324315.

The spelling of 1643472 in words is "one million, six hundred forty-three thousand, four hundred seventy-two".