1982643156 has 120 divisors (see below), whose sum is σ = 5910264360. Its totient is φ = 574138368.

The previous prime is 1982643151. The next prime is 1982643181. The reversal of 1982643156 is 6513462891.

1982643156 is a `hidden beast` number, since 198 + 26 + 431 + 5 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17139600 + 1965503556 = 4140^2 + 44334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982643151) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 57760 + ... + 85448.

It is an arithmetic number, because the mean of its divisors is an integer number (49252203).

Almost surely, 2^1982643156 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 1982643156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2955132180).

1982643156 is an abundant number, since it is smaller than the sum of its proper divisors (3927621204).

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

1982643156 is a wasteful number, since it uses less digits than its factorization.

1982643156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27735 (or 27724 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 1982643156 is about 44526.8812741247. The cubic root of 1982643156 is about 1256.2657464723.

The spelling of 1982643156 in words is "one billion, nine hundred eighty-two million, six hundred forty-three thousand, one hundred fifty-six".