213656839 has 6 divisors (see below), whose sum is σ = 234846080. Its totient is φ = 194233380.

The previous prime is 213656837. The next prime is 213656879. The reversal of 213656839 is 938656312.

It is not a de Polignac number, because 213656839 - 2¹ = 213656837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213656795 and 213656804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213656837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 882759 + ... + 883000.

Almost surely, 2^213656839 is an apocalyptic number.

213656839 is a deficient number, since it is larger than the sum of its proper divisors (21189241).

213656839 is a wasteful number, since it uses less digits than its factorization.

213656839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765781 (or 1765770 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 213656839 is about 14617.0051310109. The cubic root of 213656839 is about 597.8225136297.

The spelling of 213656839 in words is "two hundred thirteen million, six hundred fifty-six thousand, eight hundred thirty-nine".