223878213 has 12 divisors (see below), whose sum is σ = 348255180. Its totient is φ = 137771136.

The previous prime is 223878203. The next prime is 223878233. The reversal of 223878213 is 312878322.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14265729 + 209612484 = 3777^2 + 14478^2 .

It is not a de Polignac number, because 223878213 - 2⁹ = 223877701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223878203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 956628 + ... + 956861.

It is an arithmetic number, because the mean of its divisors is an integer number (29021265).

Almost surely, 2^223878213 is an apocalyptic number.

It is an amenable number.

223878213 is a deficient number, since it is larger than the sum of its proper divisors (124376967).

223878213 is a wasteful number, since it uses less digits than its factorization.

223878213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913508 (or 1913505 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 223878213 is about 14962.5603758180. The cubic root of 223878213 is about 607.2077098205.

The spelling of 223878213 in words is "two hundred twenty-three million, eight hundred seventy-eight thousand, two hundred thirteen".