223640231 has 16 divisors (see below), whose sum is σ = 238325760. Its totient is φ = 209532960.

The previous prime is 223640227. The next prime is 223640237. The reversal of 223640231 is 132046322.

It is a cyclic number.

It is not a de Polignac number, because 223640231 - 2² = 223640227 is a prime.

It is a super-3 number, since 3×223640231³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 223640197 and 223640206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223640237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128936 + ... + 130658.

It is an arithmetic number, because the mean of its divisors is an integer number (14895360).

Almost surely, 2^223640231 is an apocalyptic number.

223640231 is a deficient number, since it is larger than the sum of its proper divisors (14685529).

223640231 is a wasteful number, since it uses less digits than its factorization.

223640231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 223640231 is about 14954.6056785192. The cubic root of 223640231 is about 606.9924800963.

Adding to 223640231 its reverse (132046322), we get a palindrome (355686553).

The spelling of 223640231 in words is "two hundred twenty-three million, six hundred forty thousand, two hundred thirty-one".