538472821 has 4 divisors (see below), whose sum is σ = 555842944. Its totient is φ = 521102700.

The previous prime is 538472813. The next prime is 538472833. The reversal of 538472821 is 128274835.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 538472821 - 2³ = 538472813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538472801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8685015 + ... + 8685076.

It is an arithmetic number, because the mean of its divisors is an integer number (138960736).

Almost surely, 2^538472821 is an apocalyptic number.

It is an amenable number.

538472821 is a deficient number, since it is larger than the sum of its proper divisors (17370123).

538472821 is a wasteful number, since it uses less digits than its factorization.

538472821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17370122.

The product of its digits is 107520, while the sum is 40.

The square root of 538472821 is about 23205.0171514696. The cubic root of 538472821 is about 813.5568931978.

The spelling of 538472821 in words is "five hundred thirty-eight million, four hundred seventy-two thousand, eight hundred twenty-one".