243623 has 2 divisors, whose sum is σ = 243624. Its totient is φ = 243622.
The previous prime is 243613. The next prime is 243631. The reversal of 243623 is 326342.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 243623 - 28 = 243367 is a prime.
It is a super-2 number, since 2×2436232 = 118704332258, which contains 22 as substring.
It is a Sophie Germain prime.
It is a junction number, because it is equal to n+sod(n) for n = 243595 and 243604.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (243613) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121811 + 121812.
It is an arithmetic number, because the mean of its divisors is an integer number (121812).
2243623 is an apocalyptic number.
243623 is a deficient number, since it is larger than the sum of its proper divisors (1).
243623 is an equidigital number, since it uses as much as digits as its factorization.
243623 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 864, while the sum is 20.
The square root of 243623 is about 493.5818067960. The cubic root of 243623 is about 62.4557980797.
Adding to 243623 its reverse (326342), we get a palindrome (569965).
The spelling of 243623 in words is "two hundred forty-three thousand, six hundred twenty-three".
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