405240241 has 6 divisors (see below), whose sum is σ = 471401970. Its totient is φ = 347348736.

The previous prime is 405240233. The next prime is 405240281. The reversal of 405240241 is 142042504.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 251381025 + 153859216 = 15855^2 + 12404^2 .

It is not a de Polignac number, because 405240241 - 2³ = 405240233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405240211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4135056 + ... + 4135153.

It is an arithmetic number, because the mean of its divisors is an integer number (78566995).

Almost surely, 2^405240241 is an apocalyptic number.

It is an amenable number.

405240241 is a deficient number, since it is larger than the sum of its proper divisors (66161729).

405240241 is an equidigital number, since it uses as much as digits as its factorization.

405240241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8270223 (or 8270216 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 405240241 is about 20130.5797482338. The cubic root of 405240241 is about 740.0098860379.

Adding to 405240241 its reverse (142042504), we get a palindrome (547282745).

The spelling of 405240241 in words is "four hundred five million, two hundred forty thousand, two hundred forty-one".