243440025 has 24 divisors (see below), whose sum is σ = 411057024. Its totient is φ = 127070400.

The previous prime is 243439969. The next prime is 243440033. The reversal of 243440025 is 520044342.

It is not a de Polignac number, because 243440025 - 2⁷ = 243439897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243439977 and 243440004.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 31006 + ... + 38055.

It is an arithmetic number, because the mean of its divisors is an integer number (17127376).

Almost surely, 2^243440025 is an apocalyptic number.

243440025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243440025 is a deficient number, since it is larger than the sum of its proper divisors (167616999).

243440025 is a wasteful number, since it uses less digits than its factorization.

243440025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69121 (or 69116 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 243440025 is about 15602.5646930240. The cubic root of 243440025 is about 624.4015818827.

Adding to 243440025 its reverse (520044342), we get a palindrome (763484367).

The spelling of 243440025 in words is "two hundred forty-three million, four hundred forty thousand, twenty-five".