40128943 has 4 divisors (see below), whose sum is σ = 40579920. Its totient is φ = 39677968.

The previous prime is 40128937. The next prime is 40128961. The reversal of 40128943 is 34982104.

40128943 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 40128943 - 2¹⁷ = 39997871 is a prime.

It is a super-2 number, since 2×40128943² = 3220664132594498, 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 (40128643) 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, 225355 + ... + 225532.

It is an arithmetic number, because the mean of its divisors is an integer number (10144980).

Almost surely, 2^40128943 is an apocalyptic number.

40128943 is a deficient number, since it is larger than the sum of its proper divisors (450977).

40128943 is an equidigital number, since it uses as much as digits as its factorization.

40128943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450976.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40128943 is about 6334.7409576083. The cubic root of 40128943 is about 342.3622775528.

The spelling of 40128943 in words is "forty million, one hundred twenty-eight thousand, nine hundred forty-three".