1987829243 has 2 divisors, whose sum is σ = 1987829244. Its totient is φ = 1987829242.

The previous prime is 1987829209. The next prime is 1987829251. The reversal of 1987829243 is 3429287891.

It is a strong prime.

It is an emirp because it is prime and its reverse (3429287891) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987829243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1987829293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993914621 + 993914622.

It is an arithmetic number, because the mean of its divisors is an integer number (993914622).

Almost surely, 2^1987829243 is an apocalyptic number.

1987829243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987829243 is an equidigital number, since it uses as much as digits as its factorization.

1987829243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 1987829243 is about 44585.0787035304. The cubic root of 1987829243 is about 1257.3601493427.

The spelling of 1987829243 in words is "one billion, nine hundred eighty-seven million, eight hundred twenty-nine thousand, two hundred forty-three".