213766789 has 4 divisors (see below), whose sum is σ = 226341324. Its totient is φ = 201192256.

The previous prime is 213766771. The next prime is 213766799. The reversal of 213766789 is 987667312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70006689 + 143760100 = 8367^2 + 11990^2 .

It is a cyclic number.

It is not a de Polignac number, because 213766789 - 2¹⁹ = 213242501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213766799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6287242 + ... + 6287275.

It is an arithmetic number, because the mean of its divisors is an integer number (56585331).

Almost surely, 2^213766789 is an apocalyptic number.

It is an amenable number.

213766789 is a deficient number, since it is larger than the sum of its proper divisors (12574535).

213766789 is a wasteful number, since it uses less digits than its factorization.

213766789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12574534.

The product of its digits is 762048, while the sum is 49.

The square root of 213766789 is about 14620.7656776244. The cubic root of 213766789 is about 597.9250445755.

The spelling of 213766789 in words is "two hundred thirteen million, seven hundred sixty-six thousand, seven hundred eighty-nine".