43538661 has 16 divisors (see below), whose sum is σ = 66003520. Its totient is φ = 28350000.

The previous prime is 43538659. The next prime is 43538681. The reversal of 43538661 is 16683534.

It is not a de Polignac number, because 43538661 - 2¹ = 43538659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43538611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17590 + ... + 19911.

It is an arithmetic number, because the mean of its divisors is an integer number (4125220).

Almost surely, 2^43538661 is an apocalyptic number.

It is an amenable number.

43538661 is a deficient number, since it is larger than the sum of its proper divisors (22464859).

43538661 is a wasteful number, since it uses less digits than its factorization.

43538661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37553 (or 37547 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 43538661 is about 6598.3832110601. The cubic root of 43538661 is about 351.7966418572.

The spelling of 43538661 in words is "forty-three million, five hundred thirty-eight thousand, six hundred sixty-one".