8420448169 has 9 divisors (see below), whose sum is σ = 9795962487. Its totient is φ = 7216976424.

The previous prime is 8420448167. The next prime is 8420448173. The reversal of 8420448169 is 9618440248.

The square root of 8420448169 is 91763.

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

It can be written as a sum of positive squares in only one way, i.e., 3222038169 + 5198410000 = 56763^2 + 72100^2 .

It is not a de Polignac number, because 8420448169 - 2¹ = 8420448167 is a prime.

It is a super-2 number, since 2×8420448169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8420448167) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 635787 + ... + 648895.

Almost surely, 2^8420448169 is an apocalyptic number.

8420448169 is the 91763-rd square number.

8420448169 is the 45882-nd centered octagonal number.

It is an amenable number.

8420448169 is a deficient number, since it is larger than the sum of its proper divisors (1375514318).

8420448169 is an frugal number, since it uses more digits than its factorization.

8420448169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26232 (or 13116 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The cubic root of 8420448169 is about 2034.4408567111.

The spelling of 8420448169 in words is "eight billion, four hundred twenty million, four hundred forty-eight thousand, one hundred sixty-nine".