223840381 has 2 divisors, whose sum is σ = 223840382. Its totient is φ = 223840380.

The previous prime is 223840333. The next prime is 223840391. The reversal of 223840381 is 183048322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223652025 + 188356 = 14955^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 223840381 - 2¹¹ = 223838333 is a prime.

It is a super-2 number, since 2×223840381² = 100209032332450322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223840391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111920190 + 111920191.

It is an arithmetic number, because the mean of its divisors is an integer number (111920191).

Almost surely, 2^223840381 is an apocalyptic number.

It is an amenable number.

223840381 is a deficient number, since it is larger than the sum of its proper divisors (1).

223840381 is an equidigital number, since it uses as much as digits as its factorization.

223840381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 223840381 is about 14961.2961002715. The cubic root of 223840381 is about 607.1735049495.

The spelling of 223840381 in words is "two hundred twenty-three million, eight hundred forty thousand, three hundred eighty-one".