1643618382 has 32 divisors (see below), whose sum is σ = 3758130432. Its totient is φ = 469444224.

The previous prime is 1643618381. The next prime is 1643618407. The reversal of 1643618382 is 2838163461.

1643618382 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643618381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175318 + ... + 184454.

It is an arithmetic number, because the mean of its divisors is an integer number (117441576).

Almost surely, 2^1643618382 is an apocalyptic number.

1643618382 is an abundant number, since it is smaller than the sum of its proper divisors (2114512050).

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

1643618382 is a wasteful number, since it uses less digits than its factorization.

1643618382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13432.

The product of its digits is 165888, while the sum is 42.

The square root of 1643618382 is about 40541.5636353607. The cubic root of 1643618382 is about 1180.1403601110.

The spelling of 1643618382 in words is "one billion, six hundred forty-three million, six hundred eighteen thousand, three hundred eighty-two".