213987847 has 2 divisors, whose sum is σ = 213987848. Its totient is φ = 213987846.

The previous prime is 213987821. The next prime is 213987887. The reversal of 213987847 is 748789312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213987847 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213987847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213987887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106993923 + 106993924.

It is an arithmetic number, because the mean of its divisors is an integer number (106993924).

Almost surely, 2^213987847 is an apocalyptic number.

213987847 is a deficient number, since it is larger than the sum of its proper divisors (1).

213987847 is an equidigital number, since it uses as much as digits as its factorization.

213987847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 213987847 is about 14628.3234514417. The cubic root of 213987847 is about 598.1310799780.

The spelling of 213987847 in words is "two hundred thirteen million, nine hundred eighty-seven thousand, eight hundred forty-seven".