40428665 has 24 divisors (see below), whose sum is σ = 51479064. Its totient is φ = 30451200.

The previous prime is 40428653. The next prime is 40428677. The reversal of 40428665 is 56682404.

40428665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40428653) and next prime (40428677).

It can be written as a sum of positive squares in 12 ways, for example, as 36048016 + 4380649 = 6004^2 + 2093^2 .

It is not a de Polignac number, because 40428665 - 2⁴ = 40428649 is a prime.

It is a Duffinian 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 23 ways as a sum of consecutive naturals, for example, 662735 + ... + 662795.

It is an arithmetic number, because the mean of its divisors is an integer number (2144961).

Almost surely, 2^40428665 is an apocalyptic number.

It is an amenable number.

40428665 is a deficient number, since it is larger than the sum of its proper divisors (11050399).

40428665 is an equidigital number, since it uses as much as digits as its factorization.

40428665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 40428665 is about 6358.3539536581. The cubic root of 40428665 is about 343.2125291103.

The spelling of 40428665 in words is "forty million, four hundred twenty-eight thousand, six hundred sixty-five".