43166721 has 8 divisors (see below), whose sum is σ = 61983040. Its totient is φ = 26564112.

The previous prime is 43166719. The next prime is 43166737. The reversal of 43166721 is 12766134.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43166721 - 2¹ = 43166719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43166741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 553381 + ... + 553458.

It is an arithmetic number, because the mean of its divisors is an integer number (7747880).

Almost surely, 2^43166721 is an apocalyptic number.

It is an amenable number.

43166721 is a deficient number, since it is larger than the sum of its proper divisors (18816319).

43166721 is a wasteful number, since it uses less digits than its factorization.

43166721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106855.

The product of its digits is 6048, while the sum is 30.

The square root of 43166721 is about 6570.1385830133. The cubic root of 43166721 is about 350.7920050818.

The spelling of 43166721 in words is "forty-three million, one hundred sixty-six thousand, seven hundred twenty-one".