40015521 has 24 divisors (see below), whose sum is σ = 71140160. Its totient is φ = 21106656.

The previous prime is 40015519. The next prime is 40015543. The reversal of 40015521 is 12551004.

It is not a de Polignac number, because 40015521 - 2¹ = 40015519 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40015494 and 40015503.

It is not an unprimeable number, because it can be changed into a prime (40015571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23611 + ... + 25248.

Almost surely, 2^40015521 is an apocalyptic number.

It is an amenable number.

40015521 is a deficient number, since it is larger than the sum of its proper divisors (31124639).

40015521 is a wasteful number, since it uses less digits than its factorization.

40015521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48885 (or 48882 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 40015521 is about 6325.7822441181. The cubic root of 40015521 is about 342.0394178430.

Adding to 40015521 its reverse (12551004), we get a palindrome (52566525).

The spelling of 40015521 in words is "forty million, fifteen thousand, five hundred twenty-one".