40521605 has 16 divisors (see below), whose sum is σ = 49379328. Its totient is φ = 31920000.

The previous prime is 40521599. The next prime is 40521631. The reversal of 40521605 is 50612504.

40521605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40521605 - 2⁴ = 40521589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144065 + ... + 144345.

It is an arithmetic number, because the mean of its divisors is an integer number (3086208).

Almost surely, 2^40521605 is an apocalyptic number.

It is an amenable number.

40521605 is a deficient number, since it is larger than the sum of its proper divisors (8857723).

40521605 is a wasteful number, since it uses less digits than its factorization.

40521605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 40521605 is about 6365.6582534723. The cubic root of 40521605 is about 343.4753274691.

The spelling of 40521605 in words is "forty million, five hundred twenty-one thousand, six hundred five".