40128879 has 8 divisors (see below), whose sum is σ = 61148800. Its totient is φ = 22930776.

The previous prime is 40128877. The next prime is 40128901. The reversal of 40128879 is 97882104.

40128879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 40128879 - 2¹ = 40128877 is a prime.

It is a super-2 number, since 2×40128879² = 3220653859593282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128871) 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 7 ways as a sum of consecutive naturals, for example, 955429 + ... + 955470.

It is an arithmetic number, because the mean of its divisors is an integer number (7643600).

Almost surely, 2^40128879 is an apocalyptic number.

40128879 is a deficient number, since it is larger than the sum of its proper divisors (21019921).

40128879 is a wasteful number, since it uses less digits than its factorization.

40128879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910909.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 40128879 is about 6334.7359060974. The cubic root of 40128879 is about 342.3620955462.

The spelling of 40128879 in words is "forty million, one hundred twenty-eight thousand, eight hundred seventy-nine".