43728257 has 2 divisors, whose sum is σ = 43728258. Its totient is φ = 43728256.

The previous prime is 43728247. The next prime is 43728319. The reversal of 43728257 is 75282734.

43728257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41165056 + 2563201 = 6416^2 + 1601^2 .

It is a cyclic number.

It is not a de Polignac number, because 43728257 - 2¹⁶ = 43662721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43728257.

It is not a weakly prime, because it can be changed into another prime (43728227) 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 as a sum of consecutive naturals, namely, 21864128 + 21864129.

It is an arithmetic number, because the mean of its divisors is an integer number (21864129).

Almost surely, 2^43728257 is an apocalyptic number.

It is an amenable number.

43728257 is a deficient number, since it is larger than the sum of its proper divisors (1).

43728257 is an equidigital number, since it uses as much as digits as its factorization.

43728257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 38.

The square root of 43728257 is about 6612.7344570911. The cubic root of 43728257 is about 352.3065538194.

The spelling of 43728257 in words is "forty-three million, seven hundred twenty-eight thousand, two hundred fifty-seven".