538492721 has 8 divisors (see below), whose sum is σ = 605129280. Its totient is φ = 475458192.

The previous prime is 538492679. The next prime is 538492753. The reversal of 538492721 is 127294835.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 538492721 - 2¹⁸ = 538230577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538492781) 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 7 ways as a sum of consecutive naturals, for example, 900191 + ... + 900788.

It is an arithmetic number, because the mean of its divisors is an integer number (75641160).

Almost surely, 2^538492721 is an apocalyptic number.

It is an amenable number.

538492721 is a deficient number, since it is larger than the sum of its proper divisors (66636559).

538492721 is a wasteful number, since it uses less digits than its factorization.

538492721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801015.

The product of its digits is 120960, while the sum is 41.

The square root of 538492721 is about 23205.4459340906. The cubic root of 538492721 is about 813.5669151104.

The spelling of 538492721 in words is "five hundred thirty-eight million, four hundred ninety-two thousand, seven hundred twenty-one".