53438993 has 4 divisors (see below), whose sum is σ = 54171108. Its totient is φ = 52706880.

The previous prime is 53438977. The next prime is 53439013. The reversal of 53438993 is 39983435.

53438993 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, and also an emirpimes, since its reverse is a distinct semiprime: 39983435 = 5 ⋅7996687.

It can be written as a sum of positive squares in 2 ways, for example, as 10837264 + 42601729 = 3292^2 + 6527^2 .

It is a cyclic number.

It is not a de Polignac number, because 53438993 - 2⁴ = 53438977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53438093) 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, 365948 + ... + 366093.

It is an arithmetic number, because the mean of its divisors is an integer number (13542777).

Almost surely, 2^53438993 is an apocalyptic number.

It is an amenable number.

53438993 is a deficient number, since it is larger than the sum of its proper divisors (732115).

53438993 is an equidigital number, since it uses as much as digits as its factorization.

53438993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732114.

The product of its digits is 349920, while the sum is 44.

The square root of 53438993 is about 7310.1978769388. The cubic root of 53438993 is about 376.6628214642.

The spelling of 53438993 in words is "fifty-three million, four hundred thirty-eight thousand, nine hundred ninety-three".