40021306 has 8 divisors (see below), whose sum is σ = 64649844. Its totient is φ = 18471360.

The previous prime is 40021273. The next prime is 40021313. The reversal of 40021306 is 60312004.

40021306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 38950081 + 1071225 = 6241^2 + 1035^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 40021306.

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 3 ways as a sum of consecutive naturals, for example, 769615 + ... + 769666.

Almost surely, 2^40021306 is an apocalyptic number.

40021306 is a deficient number, since it is larger than the sum of its proper divisors (24628538).

40021306 is a wasteful number, since it uses less digits than its factorization.

40021306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539296.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40021306 is about 6326.2394832950. The cubic root of 40021306 is about 342.0558998033.

The spelling of 40021306 in words is "forty million, twenty-one thousand, three hundred six".