43989161 has 8 divisors (see below), whose sum is σ = 47090400. Its totient is φ = 40966560.

The previous prime is 43989157. The next prime is 43989173. The reversal of 43989161 is 16198934.

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

It is a cyclic number.

It is not a de Polignac number, because 43989161 - 2² = 43989157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43989131) 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, 18500 + ... + 20741.

It is an arithmetic number, because the mean of its divisors is an integer number (5886300).

Almost surely, 2^43989161 is an apocalyptic number.

It is an amenable number.

43989161 is a deficient number, since it is larger than the sum of its proper divisors (3101239).

43989161 is a wasteful number, since it uses less digits than its factorization.

43989161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39319.

The product of its digits is 46656, while the sum is 41.

The square root of 43989161 is about 6632.4325100222. The cubic root of 43989161 is about 353.0058421779.

The spelling of 43989161 in words is "forty-three million, nine hundred eighty-nine thousand, one hundred sixty-one".