243641405 has 16 divisors (see below), whose sum is σ = 334575360. Its totient is φ = 166849152.

The previous prime is 243641401. The next prime is 243641417. The reversal of 243641405 is 504146342.

It is a cyclic number.

It is not a de Polignac number, because 243641405 - 2² = 243641401 is a prime.

It is a super-2 number, since 2×243641405² = 118722268460748050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243641401) 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, 25217 + ... + 33513.

It is an arithmetic number, because the mean of its divisors is an integer number (20910960).

Almost surely, 2^243641405 is an apocalyptic number.

It is an amenable number.

243641405 is a deficient number, since it is larger than the sum of its proper divisors (90933955).

243641405 is an equidigital number, since it uses as much as digits as its factorization.

243641405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9148.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 243641405 is about 15609.0167851790. The cubic root of 243641405 is about 624.5737082400.

Adding to 243641405 its reverse (504146342), we get a palindrome (747787747).

The spelling of 243641405 in words is "two hundred forty-three million, six hundred forty-one thousand, four hundred five".