1979985187752 has 128 divisors (see below), whose sum is σ = 5833689240960. Its totient is φ = 552094571520.

The previous prime is 1979985187681. The next prime is 1979985187781. The reversal of 1979985187752 is 2577815899791.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177978 + ... + 1997910.

It is an arithmetic number, because the mean of its divisors is an integer number (45575697195).

Almost surely, 2^{1979985187752} is an apocalyptic number.

1979985187752 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1979985187752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2916844620480).

1979985187752 is an abundant number, since it is smaller than the sum of its proper divisors (3853704053208).

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

1979985187752 is a wasteful number, since it uses less digits than its factorization.

1979985187752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820283 (or 1820279 counting only the distinct ones).

The product of its digits is 800150400, while the sum is 78.

The spelling of 1979985187752 in words is "one trillion, nine hundred seventy-nine billion, nine hundred eighty-five million, one hundred eighty-seven thousand, seven hundred fifty-two".