43967799225 has 81 divisors (see below), whose sum is σ = 91654450797. Its totient is φ = 20089500480.

The previous prime is 43967799223. The next prime is 43967799247. The reversal of 43967799225 is 52299776934.

The square root of 43967799225 is 209685.

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

It can be written as a sum of positive squares in 4 ways, for example, as 21258514809 + 22709284416 = 145803^2 + 150696^2 .

It is not a de Polignac number, because 43967799225 - 2¹ = 43967799223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43967799223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 22015927 + ... + 22017923.

Almost surely, 2^43967799225 is an apocalyptic number.

43967799225 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

43967799225 is the 209685-th square number.

43967799225 is the 104843-rd centered octagonal number.

It is an amenable number.

43967799225 is an abundant number, since it is smaller than the sum of its proper divisors (47686651572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43967799225 is an equidigital number, since it uses as much as digits as its factorization.

43967799225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024 (or 2012 counting only the distinct ones).

The product of its digits is 51438240, while the sum is 63.

The spelling of 43967799225 in words is "forty-three billion, nine hundred sixty-seven million, seven hundred ninety-nine thousand, two hundred twenty-five".