1643420532 has 96 divisors (see below), whose sum is σ = 4402944000. Its totient is φ = 472614912.

The previous prime is 1643420503. The next prime is 1643420533. The reversal of 1643420532 is 2350243461.

It is a self number, because there is not a number n which added to its sum of digits gives 1643420532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643420533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 393069 + ... + 397227.

It is an arithmetic number, because the mean of its divisors is an integer number (45864000).

Almost surely, 2^1643420532 is an apocalyptic number.

1643420532 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 1643420532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2201472000).

1643420532 is an abundant number, since it is smaller than the sum of its proper divisors (2759523468).

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

1643420532 is a wasteful number, since it uses less digits than its factorization.

1643420532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345 (or 4343 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 1643420532 is about 40539.1234735040. The cubic root of 1643420532 is about 1180.0930052136.

Adding to 1643420532 its reverse (2350243461), we get a palindrome (3993663993).

The spelling of 1643420532 in words is "one billion, six hundred forty-three million, four hundred twenty thousand, five hundred thirty-two".