1980136978 has 8 divisors (see below), whose sum is σ = 3033401472. Its totient is φ = 969003156.

The previous prime is 1980136969. The next prime is 1980136979. The reversal of 1980136978 is 8796310891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1980136979) 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, 10532550 + ... + 10532737.

It is an arithmetic number, because the mean of its divisors is an integer number (379175184).

Almost surely, 2^1980136978 is an apocalyptic number.

1980136978 is a deficient number, since it is larger than the sum of its proper divisors (1053264494).

1980136978 is a wasteful number, since it uses less digits than its factorization.

1980136978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21065336.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 1980136978 is about 44498.7300717672. The cubic root of 1980136978 is about 1255.7361919233.

The spelling of 1980136978 in words is "one billion, nine hundred eighty million, one hundred thirty-six thousand, nine hundred seventy-eight".