213947 has 2 divisors, whose sum is σ = 213948. Its totient is φ = 213946.

The previous prime is 213943. The next prime is 213949. The reversal of 213947 is 749312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213947 - 2² = 213943 is a prime.

Together with 213949, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213947.

It is not a weakly prime, because it can be changed into another prime (213943) 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, 106973 + 106974.

It is an arithmetic number, because the mean of its divisors is an integer number (106974).

2²¹³⁹⁴⁷ is an apocalyptic number.

213947 is a deficient number, since it is larger than the sum of its proper divisors (1).

213947 is an equidigital number, since it uses as much as digits as its factorization.

213947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 26.

The square root of 213947 is about 462.5440519561. The cubic root of 213947 is about 59.8093019538.

The spelling of 213947 in words is "two hundred thirteen thousand, nine hundred forty-seven".