1980912979 has 4 divisors (see below), whose sum is σ = 1994031760. Its totient is φ = 1967794200.

The previous prime is 1980912977. The next prime is 1980913007. The reversal of 1980912979 is 9792190891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9792190891 = 7 ⋅1398884413.

It is a cyclic number.

It is not a de Polignac number, because 1980912979 - 2¹ = 1980912977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980912971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6559164 + ... + 6559465.

It is an arithmetic number, because the mean of its divisors is an integer number (498507940).

Almost surely, 2^1980912979 is an apocalyptic number.

1980912979 is a deficient number, since it is larger than the sum of its proper divisors (13118781).

1980912979 is a wasteful number, since it uses less digits than its factorization.

1980912979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13118780.

The product of its (nonzero) digits is 734832, while the sum is 55.

The square root of 1980912979 is about 44507.4485788615. The cubic root of 1980912979 is about 1255.9002084005.

It can be divided in two parts, 1980912 and 979, that added together give a palindrome (1981891).

The spelling of 1980912979 in words is "one billion, nine hundred eighty million, nine hundred twelve thousand, nine hundred seventy-nine".