838453521 has 4 divisors (see below), whose sum is σ = 1117938032. Its totient is φ = 558969012.

The previous prime is 838453513. The next prime is 838453531. The reversal of 838453521 is 125354838.

838453521 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 838453521 - 2³ = 838453513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 838453521.

It is not an unprimeable number, because it can be changed into a prime (838453531) 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, 139742251 + ... + 139742256.

It is an arithmetic number, because the mean of its divisors is an integer number (279484508).

Almost surely, 2^838453521 is an apocalyptic number.

It is an amenable number.

838453521 is a deficient number, since it is larger than the sum of its proper divisors (279484511).

838453521 is a wasteful number, since it uses less digits than its factorization.

838453521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279484510.

The product of its digits is 115200, while the sum is 39.

The square root of 838453521 is about 28956.0619042024. The cubic root of 838453521 is about 942.9594074470.

The spelling of 838453521 in words is "eight hundred thirty-eight million, four hundred fifty-three thousand, five hundred twenty-one".