40415521 has 4 divisors (see below), whose sum is σ = 41178132. Its totient is φ = 39652912.

The previous prime is 40415519. The next prime is 40415549. The reversal of 40415521 is 12551404.

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 34939921 + 5475600 = 5911^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 40415521 - 2¹ = 40415519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40415492 and 40415501.

It is not an unprimeable number, because it can be changed into a prime (40415321) 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, 381226 + ... + 381331.

It is an arithmetic number, because the mean of its divisors is an integer number (10294533).

Almost surely, 2^40415521 is an apocalyptic number.

It is an amenable number.

40415521 is a deficient number, since it is larger than the sum of its proper divisors (762611).

40415521 is an equidigital number, since it uses as much as digits as its factorization.

40415521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762610.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 40415521 is about 6357.3202687925. The cubic root of 40415521 is about 343.1753304671.

Adding to 40415521 its reverse (12551404), we get a palindrome (52966925).

The spelling of 40415521 in words is "forty million, four hundred fifteen thousand, five hundred twenty-one".