40521306 has 16 divisors (see below), whose sum is σ = 92620224. Its totient is φ = 11577504.

The previous prime is 40521289. The next prime is 40521329. The reversal of 40521306 is 60312504.

It is a happy number.

40521306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 482355 + ... + 482438.

It is an arithmetic number, because the mean of its divisors is an integer number (5788764).

Almost surely, 2^40521306 is an apocalyptic number.

40521306 is an abundant number, since it is smaller than the sum of its proper divisors (52098918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40521306 is a wasteful number, since it uses less digits than its factorization.

40521306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964805.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 40521306 is about 6365.6347680337. The cubic root of 40521306 is about 343.4744826575.

The spelling of 40521306 in words is "forty million, five hundred twenty-one thousand, three hundred six".