223439987 has 2 divisors, whose sum is σ = 223439988. Its totient is φ = 223439986.

The previous prime is 223439969. The next prime is 223439989. The reversal of 223439987 is 789934322.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223439987 is a prime.

Together with 223439989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (223439989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111719993 + 111719994.

It is an arithmetic number, because the mean of its divisors is an integer number (111719994).

Almost surely, 2^223439987 is an apocalyptic number.

223439987 is a deficient number, since it is larger than the sum of its proper divisors (1).

223439987 is an equidigital number, since it uses as much as digits as its factorization.

223439987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 223439987 is about 14947.9091180004. The cubic root of 223439987 is about 606.8112621096.

The spelling of 223439987 in words is "two hundred twenty-three million, four hundred thirty-nine thousand, nine hundred eighty-seven".