43942166 has 4 divisors (see below), whose sum is σ = 65913252. Its totient is φ = 21971082.

The previous prime is 43942153. The next prime is 43942181. The reversal of 43942166 is 66124934.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×43942166³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10985540 + ... + 10985543.

It is an arithmetic number, because the mean of its divisors is an integer number (16478313).

Almost surely, 2^43942166 is an apocalyptic number.

43942166 is a deficient number, since it is larger than the sum of its proper divisors (21971086).

43942166 is a wasteful number, since it uses less digits than its factorization.

43942166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21971085.

The product of its digits is 31104, while the sum is 35.

The square root of 43942166 is about 6628.8887454837. Note that the first 3 decimals coincide. The cubic root of 43942166 is about 352.8800883151.

The spelling of 43942166 in words is "forty-three million, nine hundred forty-two thousand, one hundred sixty-six".