1971340056 has 96 divisors (see below), whose sum is σ = 6108211200. Its totient is φ = 562645440.

The previous prime is 1971340001. The next prime is 1971340061. The reversal of 1971340056 is 6500431791.

1971340056 is a `hidden beast` number, since 197 + 13 + 400 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1971340056.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 740055 + ... + 742713.

It is an arithmetic number, because the mean of its divisors is an integer number (63627200).

Almost surely, 2^1971340056 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 1971340056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3054105600).

1971340056 is an abundant number, since it is smaller than the sum of its proper divisors (4136871144).

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

1971340056 is a wasteful number, since it uses less digits than its factorization.

1971340056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149 (or 4142 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 1971340056 is about 44399.7754048374. The cubic root of 1971340056 is about 1253.8738607735.

The spelling of 1971340056 in words is "one billion, nine hundred seventy-one million, three hundred forty thousand, fifty-six".