40055993 has 4 divisors (see below), whose sum is σ = 40231140. Its totient is φ = 39880848.

The previous prime is 40055987. The next prime is 40056007. The reversal of 40055993 is 39955004.

40055993 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 can be written as a sum of positive squares in 2 ways, for example, as 29899024 + 10156969 = 5468^2 + 3187^2 .

It is a cyclic number.

It is not a de Polignac number, because 40055993 - 2¹⁰ = 40054969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40052993) 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, 87230 + ... + 87687.

It is an arithmetic number, because the mean of its divisors is an integer number (10057785).

Almost surely, 2^40055993 is an apocalyptic number.

It is an amenable number.

40055993 is a deficient number, since it is larger than the sum of its proper divisors (175147).

40055993 is a wasteful number, since it uses less digits than its factorization.

40055993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175146.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 40055993 is about 6328.9804076170. The cubic root of 40055993 is about 342.1546927382.

The spelling of 40055993 in words is "forty million, fifty-five thousand, nine hundred ninety-three".