213947893 has 2 divisors, whose sum is σ = 213947894. Its totient is φ = 213947892.

The previous prime is 213947861. The next prime is 213947897. The reversal of 213947893 is 398749312.

213947893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181252369 + 32695524 = 13463^2 + 5718^2 .

It is a cyclic number.

It is not a de Polignac number, because 213947893 - 2⁵ = 213947861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213947897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106973946 + 106973947.

It is an arithmetic number, because the mean of its divisors is an integer number (106973947).

Almost surely, 2^213947893 is an apocalyptic number.

It is an amenable number.

213947893 is a deficient number, since it is larger than the sum of its proper divisors (1).

213947893 is an equidigital number, since it uses as much as digits as its factorization.

213947893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 213947893 is about 14626.9577493066. The cubic root of 213947893 is about 598.0938516696.

It can be divided in two parts, 213947 and 893, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 213947893 in words is "two hundred thirteen million, nine hundred forty-seven thousand, eight hundred ninety-three".