405121441 has 4 divisors (see below), whose sum is σ = 428952132. Its totient is φ = 381290752.

The previous prime is 405121433. The next prime is 405121469. The reversal of 405121441 is 144121504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 298598400 + 106523041 = 17280^2 + 10321^2 .

It is a cyclic number.

It is not a de Polignac number, because 405121441 - 2³ = 405121433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405121411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11915320 + ... + 11915353.

It is an arithmetic number, because the mean of its divisors is an integer number (107238033).

Almost surely, 2^405121441 is an apocalyptic number.

It is an amenable number.

405121441 is a deficient number, since it is larger than the sum of its proper divisors (23830691).

405121441 is a wasteful number, since it uses less digits than its factorization.

405121441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23830690.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 405121441 is about 20127.6287972528. The cubic root of 405121441 is about 739.9375653436.

Adding to 405121441 its reverse (144121504), we get a palindrome (549242945).

The spelling of 405121441 in words is "four hundred five million, one hundred twenty-one thousand, four hundred forty-one".