43721525 has 12 divisors (see below), whose sum is σ = 54959652. Its totient is φ = 34496640.

The previous prime is 43721479. The next prime is 43721549. The reversal of 43721525 is 52512734.

It is a happy number.

43721525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 174724 + 43546801 = 418^2 + 6599^2 .

It is not a de Polignac number, because 43721525 - 2⁸ = 43721269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 10154 + ... + 13803.

It is an arithmetic number, because the mean of its divisors is an integer number (4579971).

Almost surely, 2^43721525 is an apocalyptic number.

It is an amenable number.

43721525 is a deficient number, since it is larger than the sum of its proper divisors (11238127).

43721525 is a wasteful number, since it uses less digits than its factorization.

43721525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24040 (or 24035 counting only the distinct ones).

The product of its digits is 8400, while the sum is 29.

The square root of 43721525 is about 6612.2254196299. The cubic root of 43721525 is about 352.2884736001.

The spelling of 43721525 in words is "forty-three million, seven hundred twenty-one thousand, five hundred twenty-five".