43852721 has 4 divisors (see below), whose sum is σ = 47839344. Its totient is φ = 39866100.

The previous prime is 43852709. The next prime is 43852751. The reversal of 43852721 is 12725834.

43852721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43852721 - 2¹⁸ = 43590577 is a prime.

It is a super-2 number, since 2×43852721² = 3846122278207682, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43852751) 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 3 ways as a sum of consecutive naturals, for example, 1993295 + ... + 1993316.

It is an arithmetic number, because the mean of its divisors is an integer number (11959836).

Almost surely, 2^43852721 is an apocalyptic number.

It is an amenable number.

43852721 is a deficient number, since it is larger than the sum of its proper divisors (3986623).

43852721 is a wasteful number, since it uses less digits than its factorization.

43852721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986622.

The product of its digits is 13440, while the sum is 32.

The square root of 43852721 is about 6622.1387028663. The cubic root of 43852721 is about 352.6404946056.

The spelling of 43852721 in words is "forty-three million, eight hundred fifty-two thousand, seven hundred twenty-one".