43942161 has 12 divisors (see below), whose sum is σ = 62239952. Its totient is φ = 27571008.

The previous prime is 43942153. The next prime is 43942181. The reversal of 43942161 is 16124934.

It is not a de Polignac number, because 43942161 - 2³ = 43942153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43942111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24475 + ... + 26208.

Almost surely, 2^43942161 is an apocalyptic number.

It is an amenable number.

43942161 is a deficient number, since it is larger than the sum of its proper divisors (18297791).

43942161 is a wasteful number, since it uses less digits than its factorization.

43942161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50720 (or 50703 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 43942161 is about 6628.8883683465. Note that the first 3 decimals coincide. The cubic root of 43942161 is about 352.8800749308.

It can be divided in two parts, 4394 and 2161, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 43942161 in words is "forty-three million, nine hundred forty-two thousand, one hundred sixty-one".