52821993 has 16 divisors (see below), whose sum is σ = 80593920. Its totient is φ = 30145296.

The previous prime is 52821983. The next prime is 52822039. The reversal of 52821993 is 39912825.

It is not a de Polignac number, because 52821993 - 2²⁵ = 19267561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (52821953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26746 + ... + 28652.

It is an arithmetic number, because the mean of its divisors is an integer number (5037120).

Almost surely, 2^52821993 is an apocalyptic number.

It is an amenable number.

52821993 is a deficient number, since it is larger than the sum of its proper divisors (27771927).

52821993 is a wasteful number, since it uses less digits than its factorization.

52821993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3236.

The product of its digits is 38880, while the sum is 39.

The square root of 52821993 is about 7267.8740357824. The cubic root of 52821993 is about 375.2075721933.

The spelling of 52821993 in words is "fifty-two million, eight hundred twenty-one thousand, nine hundred ninety-three".