213678243 has 10 divisors (see below), whose sum is σ = 319198484. Its totient is φ = 142452108.

The previous prime is 213678203. The next prime is 213678247. The reversal of 213678243 is 342876312.

It is a happy number.

It is not a de Polignac number, because 213678243 - 2⁹ = 213677731 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213678198 and 213678207.

It is not an unprimeable number, because it can be changed into a prime (213678247) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1318921 + ... + 1319082.

Almost surely, 2^213678243 is an apocalyptic number.

213678243 is a deficient number, since it is larger than the sum of its proper divisors (105520241).

213678243 is an equidigital number, since it uses as much as digits as its factorization.

213678243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638015 (or 2638006 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 213678243 is about 14617.7372736002. The cubic root of 213678243 is about 597.8424761170.

The spelling of 213678243 in words is "two hundred thirteen million, six hundred seventy-eight thousand, two hundred forty-three".