1984780874891 has 8 divisors (see below), whose sum is σ = 2005233237984. Its totient is φ = 1964344219200.

The previous prime is 1984780874831. The next prime is 1984780874893.

1984780874891 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1984780874891 - 2⁶ = 1984780874827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1984780874893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3672746 + ... + 4178351.

It is an arithmetic number, because the mean of its divisors is an integer number (250654154748).

Almost surely, 2^{1984780874891} is an apocalyptic number.

1984780874891 is a deficient number, since it is larger than the sum of its proper divisors (20452363093).

1984780874891 is a wasteful number, since it uses less digits than its factorization.

1984780874891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7853701.

The product of its (nonzero) digits is 260112384, while the sum is 74.

The spelling of 1984780874891 in words is "one trillion, nine hundred eighty-four billion, seven hundred eighty million, eight hundred seventy-four thousand, eight hundred ninety-one".