538376921 has 4 divisors (see below), whose sum is σ = 539008932. Its totient is φ = 537744912.

The previous prime is 538376903. The next prime is 538376929. The reversal of 538376921 is 129673835.

538376921 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 284293321 + 254083600 = 16861^2 + 15940^2 .

It is a cyclic number.

It is not a de Polignac number, because 538376921 - 2¹⁰ = 538375897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (538376929) 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, 314726 + ... + 316431.

It is an arithmetic number, because the mean of its divisors is an integer number (134752233).

Almost surely, 2^538376921 is an apocalyptic number.

It is an amenable number.

538376921 is a deficient number, since it is larger than the sum of its proper divisors (632011).

538376921 is an equidigital number, since it uses as much as digits as its factorization.

538376921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632010.

The product of its digits is 272160, while the sum is 44.

The square root of 538376921 is about 23202.9506959783. The cubic root of 538376921 is about 813.5085931814.

The spelling of 538376921 in words is "five hundred thirty-eight million, three hundred seventy-six thousand, nine hundred twenty-one".