2404400521 has 4 divisors (see below), whose sum is σ = 2419715332. Its totient is φ = 2389085712.

The previous prime is 2404400501. The next prime is 2404400539. The reversal of 2404400521 is 1250044042.

It is a happy number.

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 373996921 + 2030403600 = 19339^2 + 45060^2 .

It is a cyclic number.

It is not a de Polignac number, because 2404400521 - 2¹¹ = 2404398473 is a prime.

It is a super-2 number, since 2×2404400521² = 11562283730770142882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2404400492 and 2404400501.

It is not an unprimeable number, because it can be changed into a prime (2404400501) 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, 7657170 + ... + 7657483.

It is an arithmetic number, because the mean of its divisors is an integer number (604928833).

Almost surely, 2^2404400521 is an apocalyptic number.

It is an amenable number.

2404400521 is a deficient number, since it is larger than the sum of its proper divisors (15314811).

2404400521 is a wasteful number, since it uses less digits than its factorization.

2404400521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15314810.

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

The square root of 2404400521 is about 49034.6869165084. The cubic root of 2404400521 is about 1339.6836932559.

Adding to 2404400521 its reverse (1250044042), we get a palindrome (3654444563).

The spelling of 2404400521 in words is "two billion, four hundred four million, four hundred thousand, five hundred twenty-one".