1643448 has 16 divisors (see below), whose sum is σ = 4108680. Its totient is φ = 547808.

The previous prime is 1643431. The next prime is 1643461. The reversal of 1643448 is 8443461.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34215 + ... + 34262.

2^1643448 is an apocalyptic number.

It is an amenable number.

1643448 is an abundant number, since it is smaller than the sum of its proper divisors (2465232).

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

1643448 is a wasteful number, since it uses less digits than its factorization.

1643448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68486 (or 68482 counting only the distinct ones).

The product of its digits is 9216, while the sum is 30.

The square root of 1643448 is about 1281.9703584717. The cubic root of 1643448 is about 118.0099579837.

The spelling of 1643448 in words is "one million, six hundred forty-three thousand, four hundred forty-eight".