1981982753 has 8 divisors (see below), whose sum is σ = 2038989888. Its totient is φ = 1925702064.

The previous prime is 1981982747. The next prime is 1981982767. The reversal of 1981982753 is 3572891891.

It is a happy number.

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 1981982753 - 2²⁰ = 1980934177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1981982695 and 1981982704.

It is not an unprimeable number, because it can be changed into a prime (1981982773) 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, 176075 + ... + 186992.

It is an arithmetic number, because the mean of its divisors is an integer number (254873736).

Almost surely, 2^1981982753 is an apocalyptic number.

It is an amenable number.

1981982753 is a deficient number, since it is larger than the sum of its proper divisors (57007135).

1981982753 is a wasteful number, since it uses less digits than its factorization.

1981982753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363223.

The product of its digits is 1088640, while the sum is 53.

The square root of 1981982753 is about 44519.4648777363. The cubic root of 1981982753 is about 1256.1262468691.

The spelling of 1981982753 in words is "one billion, nine hundred eighty-one million, nine hundred eighty-two thousand, seven hundred fifty-three".