213243789 has 16 divisors (see below), whose sum is σ = 311471424. Its totient is φ = 128697600.

The previous prime is 213243749. The next prime is 213243799. The reversal of 213243789 is 987342312.

It is not a de Polignac number, because 213243789 - 2⁸ = 213243533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213243749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5454 + ... + 21359.

It is an arithmetic number, because the mean of its divisors is an integer number (19466964).

Almost surely, 2^213243789 is an apocalyptic number.

It is an amenable number.

213243789 is a deficient number, since it is larger than the sum of its proper divisors (98227635).

213243789 is a wasteful number, since it uses less digits than its factorization.

213243789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27068.

The product of its digits is 72576, while the sum is 39.

The square root of 213243789 is about 14602.8692043721. The cubic root of 213243789 is about 597.4370202579.

The spelling of 213243789 in words is "two hundred thirteen million, two hundred forty-three thousand, seven hundred eighty-nine".