1980971586 has 96 divisors (see below), whose sum is σ = 4883376960. Its totient is φ = 594760320.

The previous prime is 1980971561. The next prime is 1980971611. The reversal of 1980971586 is 6851790891.

It is an interprime number because it is at equal distance from previous prime (1980971561) and next prime (1980971611).

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 737001 + ... + 739683.

It is an arithmetic number, because the mean of its divisors is an integer number (50868510).

Almost surely, 2^1980971586 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980971586, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2441688480).

1980971586 is an abundant number, since it is smaller than the sum of its proper divisors (2902405374).

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

1980971586 is a wasteful number, since it uses less digits than its factorization.

1980971586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829 (or 2812 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The square root of 1980971586 is about 44508.1069694050. The cubic root of 1980971586 is about 1255.9125939046.

The spelling of 1980971586 in words is "one billion, nine hundred eighty million, nine hundred seventy-one thousand, five hundred eighty-six".