43666489 has 16 divisors (see below), whose sum is σ = 49921920. Its totient is φ = 37945600.

The previous prime is 43666487. The next prime is 43666561. The reversal of 43666489 is 98466634.

It is a cyclic number.

It is not a de Polignac number, because 43666489 - 2¹ = 43666487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43666487) 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, 9414 + ... + 13264.

It is an arithmetic number, because the mean of its divisors is an integer number (3120120).

Almost surely, 2^43666489 is an apocalyptic number.

It is an amenable number.

43666489 is a deficient number, since it is larger than the sum of its proper divisors (6255431).

43666489 is a wasteful number, since it uses less digits than its factorization.

43666489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920.

The product of its digits is 746496, while the sum is 46.

The square root of 43666489 is about 6608.0624240393. The cubic root of 43666489 is about 352.1405930503.

The spelling of 43666489 in words is "forty-three million, six hundred sixty-six thousand, four hundred eighty-nine".