1980396243 has 16 divisors (see below), whose sum is σ = 3353052160. Its totient is φ = 1131654888.

The previous prime is 1980396211. The next prime is 1980396263. The reversal of 1980396243 is 3426930891.

It is a happy number.

1980396243 is a `hidden beast` number, since 19 + 8 + 0 + 3 + 9 + 624 + 3 = 666.

1980396243 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1980396243 - 2⁵ = 1980396211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980396203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5238955 + ... + 5239332.

It is an arithmetic number, because the mean of its divisors is an integer number (209565760).

Almost surely, 2^1980396243 is an apocalyptic number.

1980396243 is a deficient number, since it is larger than the sum of its proper divisors (1372655917).

1980396243 is a wasteful number, since it uses less digits than its factorization.

1980396243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10478303 (or 10478297 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 1980396243 is about 44501.6431494389. The cubic root of 1980396243 is about 1255.7909952423.

The spelling of 1980396243 in words is "one billion, nine hundred eighty million, three hundred ninety-six thousand, two hundred forty-three".