43864729 has 2 divisors, whose sum is σ = 43864730. Its totient is φ = 43864728.

The previous prime is 43864697. The next prime is 43864739. The reversal of 43864729 is 92746834.

43864729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27583504 + 16281225 = 5252^2 + 4035^2 .

It is a cyclic number.

It is not a de Polignac number, because 43864729 - 2⁵ = 43864697 is a prime.

It is a super-2 number, since 2×43864729² = 3848228900486882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43864739) 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, 21932364 + 21932365.

It is an arithmetic number, because the mean of its divisors is an integer number (21932365).

Almost surely, 2^43864729 is an apocalyptic number.

It is an amenable number.

43864729 is a deficient number, since it is larger than the sum of its proper divisors (1).

43864729 is an equidigital number, since it uses as much as digits as its factorization.

43864729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 43.

The square root of 43864729 is about 6623.0452965384. The cubic root of 43864729 is about 352.6726790062.

The spelling of 43864729 in words is "forty-three million, eight hundred sixty-four thousand, seven hundred twenty-nine".