43046721 has 17 divisors (see below), whose sum is σ = 64570081. Its totient is φ = 28697814.

The previous prime is 43046623. The next prime is 43046747. The reversal of 43046721 is 12764034.

The square root of 43046721 is 6561.

It is a perfect power (a square, a biquadrate, a 8-th power, a 16-th power), and thus also a powerful number.

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=243.

It is not a de Polignac number, because 43046721 - 2⁹ = 43046209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 3 and base 9.

It is not an unprimeable number, because it can be changed into a prime (43046221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 16 ways as a sum of consecutive naturals, for example, 14348906 + 14348907 + 14348908.

Almost surely, 2^43046721 is an apocalyptic number.

43046721 is the 6561-st square number.

43046721 is the 3281-st centered octagonal number.

It is an amenable number.

43046721 is a deficient number, since it is larger than the sum of its proper divisors (21523360).

43046721 is an frugal number, since it uses more digits than its factorization.

43046721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48 (or 3 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The cubic root of 43046721 is about 350.4666455847.

Multiplying 43046721 by its sum of digits (27), we get a 19-th power (1162261467 = 3¹⁹).

43046721 divided by its sum of digits (27) gives a 13-th power (1594323 = 3¹³).

It can be divided in two parts, 4304 and 6721, that added together give a square (11025 = 105²).

The spelling of 43046721 in words is "forty-three million, forty-six thousand, seven hundred twenty-one".