40128887 has 4 divisors (see below), whose sum is σ = 40225080. Its totient is φ = 40032696.

The previous prime is 40128877. The next prime is 40128901. The reversal of 40128887 is 78882104.

It is a happy number.

40128887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40128887 - 2⁴ = 40128871 is a prime.

It is a super-2 number, since 2×40128887² = 3220655143717538, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40128887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128877) by changing a digit.

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, 47468 + ... + 48305.

It is an arithmetic number, because the mean of its divisors is an integer number (10056270).

Almost surely, 2^40128887 is an apocalyptic number.

40128887 is a deficient number, since it is larger than the sum of its proper divisors (96193).

40128887 is an equidigital number, since it uses as much as digits as its factorization.

40128887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96192.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 40128887 is about 6334.7365375365. The cubic root of 40128887 is about 342.3621182970.

The spelling of 40128887 in words is "forty million, one hundred twenty-eight thousand, eight hundred eighty-seven".