838621872169 has 3 divisors (see below), whose sum is σ = 838622787933. Its totient is φ = 838620956406.

The previous prime is 838621872163. The next prime is 838621872203. The reversal of 838621872169 is 961278126838.

The square root of 838621872169 is 915763.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 838621872169 - 2²⁵ = 838588317737 is a prime.

It is a super-2 number, since 2×838621872169² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (838621872163) 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 2 ways as a sum of consecutive naturals, for example, 457882 + ... + 1373644.

It is an arithmetic number, because the mean of its divisors is an integer number (279540929311).

Almost surely, 2^838621872169 is an apocalyptic number.

838621872169 is the 915763-rd square number.

838621872169 is the 457882-nd centered octagonal number.

It is an amenable number.

838621872169 is a deficient number, since it is larger than the sum of its proper divisors (915764).

838621872169 is an frugal number, since it uses more digits than its factorization.

838621872169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831526 (or 915763 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 61.

The spelling of 838621872169 in words is "eight hundred thirty-eight billion, six hundred twenty-one million, eight hundred seventy-two thousand, one hundred sixty-nine".