40128915 has 8 divisors (see below), whose sum is σ = 64206288. Its totient is φ = 21402080.

The previous prime is 40128901. The next prime is 40128917. The reversal of 40128915 is 51982104.

It is a happy number.

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

It is not a de Polignac number, because 40128915 - 2⁸ = 40128659 is a prime.

It is a super-2 number, since 2×40128915² = 3220659638154450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40128917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1337616 + ... + 1337645.

It is an arithmetic number, because the mean of its divisors is an integer number (8025786).

Almost surely, 2^40128915 is an apocalyptic number.

40128915 is a deficient number, since it is larger than the sum of its proper divisors (24077373).

40128915 is a wasteful number, since it uses less digits than its factorization.

40128915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675269.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 40128915 is about 6334.7387475728. The cubic root of 40128915 is about 342.3621979249.

The spelling of 40128915 in words is "forty million, one hundred twenty-eight thousand, nine hundred fifteen".