40043521 has 8 divisors (see below), whose sum is σ = 45809280. Its totient is φ = 34289088.

The previous prime is 40043489. The next prime is 40043527. The reversal of 40043521 is 12534004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40043521 - 2⁵ = 40043489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40043527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7065 + ... + 11401.

It is an arithmetic number, because the mean of its divisors is an integer number (5726160).

Almost surely, 2^40043521 is an apocalyptic number.

It is an amenable number.

40043521 is a deficient number, since it is larger than the sum of its proper divisors (5765759).

40043521 is a wasteful number, since it uses less digits than its factorization.

40043521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40043521 is about 6327.9950221219. The cubic root of 40043521 is about 342.1191774841.

Adding to 40043521 its reverse (12534004), we get a palindrome (52577525).

The spelling of 40043521 in words is "forty million, forty-three thousand, five hundred twenty-one".