1643496 has 48 divisors (see below), whose sum is σ = 4333440. Its totient is φ = 518880.

The previous prime is 1643491. The next prime is 1643497. The reversal of 1643496 is 6943461.

It is not an unprimeable number, because it can be changed into a prime (1643491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34945 + ... + 34991.

It is an arithmetic number, because the mean of its divisors is an integer number (90280).

2^1643496 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 1643496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2166720).

1643496 is an abundant number, since it is smaller than the sum of its proper divisors (2689944).

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

1643496 is a wasteful number, since it uses less digits than its factorization.

1643496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 83 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 1643496 is about 1281.9890795167. The cubic root of 1643496 is about 118.0111068737.

The spelling of 1643496 in words is "one million, six hundred forty-three thousand, four hundred ninety-six".