223440431 has 2 divisors, whose sum is σ = 223440432. Its totient is φ = 223440430.

The previous prime is 223440419. The next prime is 223440439. The reversal of 223440431 is 134044322.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223440431 is a prime.

It is a super-2 number, since 2×223440431² = 99851252410931522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 223440397 and 223440406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223440439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111720215 + 111720216.

It is an arithmetic number, because the mean of its divisors is an integer number (111720216).

Almost surely, 2^223440431 is an apocalyptic number.

223440431 is a deficient number, since it is larger than the sum of its proper divisors (1).

223440431 is an equidigital number, since it uses as much as digits as its factorization.

223440431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 223440431 is about 14947.9239695685. The cubic root of 223440431 is about 606.8116640431.

Adding to 223440431 its reverse (134044322), we get a palindrome (357484753).

The spelling of 223440431 in words is "two hundred twenty-three million, four hundred forty thousand, four hundred thirty-one".