40128996 has 24 divisors (see below), whose sum is σ = 95919264. Its totient is φ = 13049920.

The previous prime is 40128989. The next prime is 40129021. The reversal of 40128996 is 69982104.

It is a super-2 number, since 2×40128996² = 3220672639936032, which contains 22 as substring.

It is an unprimeable number.

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, 40290 + ... + 41273.

It is an arithmetic number, because the mean of its divisors is an integer number (3996636).

Almost surely, 2^40128996 is an apocalyptic number.

It is an amenable number.

40128996 is an abundant number, since it is smaller than the sum of its proper divisors (55790268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40128996 is a wasteful number, since it uses less digits than its factorization.

40128996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81611 (or 81609 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 40128996 is about 6334.7451408877. The cubic root of 40128996 is about 342.3624282769.

The spelling of 40128996 in words is "forty million, one hundred twenty-eight thousand, nine hundred ninety-six".