1977984247 has 2 divisors, whose sum is σ = 1977984248. Its totient is φ = 1977984246.

The previous prime is 1977984223. The next prime is 1977984259. The reversal of 1977984247 is 7424897791.

It is a strong prime.

It is an emirp because it is prime and its reverse (7424897791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1977984247 - 2¹¹ = 1977982199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1977984191 and 1977984200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977984347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988992123 + 988992124.

It is an arithmetic number, because the mean of its divisors is an integer number (988992124).

Almost surely, 2^1977984247 is an apocalyptic number.

1977984247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977984247 is an equidigital number, since it uses as much as digits as its factorization.

1977984247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 58.

The square root of 1977984247 is about 44474.5348148803. The cubic root of 1977984247 is about 1255.2809637448.

The spelling of 1977984247 in words is "one billion, nine hundred seventy-seven million, nine hundred eighty-four thousand, two hundred forty-seven".