40128881 has 12 divisors (see below), whose sum is σ = 43638912. Its totient is φ = 36884016.

The previous prime is 40128877. The next prime is 40128901. The reversal of 40128881 is 18882104.

It is not a de Polignac number, because 40128881 - 2² = 40128877 is a prime.

It is a super-2 number, since 2×40128881² = 3220654180624322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40128811) 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 11 ways as a sum of consecutive naturals, for example, 61700 + ... + 62346.

It is an arithmetic number, because the mean of its divisors is an integer number (3636576).

Almost surely, 2^40128881 is an apocalyptic number.

It is an amenable number.

40128881 is a deficient number, since it is larger than the sum of its proper divisors (3510031).

40128881 is a wasteful number, since it uses less digits than its factorization.

40128881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1027 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 40128881 is about 6334.7360639572. The cubic root of 40128881 is about 342.3621012339.

The spelling of 40128881 in words is "forty million, one hundred twenty-eight thousand, eight hundred eighty-one".