1971283986 has 64 divisors (see below), whose sum is σ = 5167964160. Its totient is φ = 545052240.

The previous prime is 1971283981. The next prime is 1971284033. The reversal of 1971283986 is 6893821791.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1971283981) 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, 72396 + ... + 95831.

It is an arithmetic number, because the mean of its divisors is an integer number (80749440).

Almost surely, 2^1971283986 is an apocalyptic number.

1971283986 is an abundant number, since it is smaller than the sum of its proper divisors (3196680174).

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

1971283986 is a wasteful number, since it uses less digits than its factorization.

1971283986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168276 (or 168270 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 1971283986 is about 44399.1439782345. The cubic root of 1971283986 is about 1253.8619728577.

The spelling of 1971283986 in words is "one billion, nine hundred seventy-one million, two hundred eighty-three thousand, nine hundred eighty-six".