40428815 has 16 divisors (see below), whose sum is σ = 56736768. Its totient is φ = 27076896.

The previous prime is 40428809. The next prime is 40428833. The reversal of 40428815 is 51882404.

It is a happy number.

40428815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-40428815 is a prime.

It is a Duffinian 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, 11927 + ... + 14936.

It is an arithmetic number, because the mean of its divisors is an integer number (3546048).

Almost surely, 2^40428815 is an apocalyptic number.

40428815 is a deficient number, since it is larger than the sum of its proper divisors (16307953).

40428815 is a wasteful number, since it uses less digits than its factorization.

40428815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26918.

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 40428815 is about 6358.3657491528. The cubic root of 40428815 is about 343.2129535766.

The spelling of 40428815 in words is "forty million, four hundred twenty-eight thousand, eight hundred fifteen".