43863856969 has 27 divisors (see below), whose sum is σ = 47249737479. Its totient is φ = 40714552800.

The previous prime is 43863856957. The next prime is 43863856973. The reversal of 43863856969 is 96965836834.

The square root of 43863856969 is 209437.

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., 24899262025 + 18964594944 = 157795^2 + 137712^2 .

It is not a de Polignac number, because 43863856969 - 2²¹ = 43861759817 is a prime.

It is a super-2 number, since 2×43863856969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (201553920) is a multiple of the sum of its prime divisors (243).

It is not an unprimeable number, because it can be changed into a prime (43893856969) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 290489044 + ... + 290489194.

It is an arithmetic number, because the mean of its divisors is an integer number (1749990277).

Almost surely, 2^43863856969 is an apocalyptic number.

43863856969 is the 209437-th square number.

43863856969 is the 104719-th centered octagonal number.

It is an amenable number.

43863856969 is a deficient number, since it is larger than the sum of its proper divisors (3385880510).

43863856969 is an frugal number, since it uses more digits than its factorization.

43863856969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 243 counting only the distinct ones).

The product of its digits is 201553920, while the sum is 67.

The spelling of 43863856969 in words is "forty-three billion, eight hundred sixty-three million, eight hundred fifty-six thousand, nine hundred sixty-nine".