43907661 has 24 divisors (see below), whose sum is σ = 72658560. Its totient is φ = 25029216.

The previous prime is 43907659. The next prime is 43907683. The reversal of 43907661 is 16670934.

It is not a de Polignac number, because 43907661 - 2¹ = 43907659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43917661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44176 + ... + 45158.

It is an arithmetic number, because the mean of its divisors is an integer number (3027440).

Almost surely, 2^43907661 is an apocalyptic number.

It is an amenable number.

43907661 is a deficient number, since it is larger than the sum of its proper divisors (28750899).

43907661 is a wasteful number, since it uses less digits than its factorization.

43907661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 43907661 is about 6626.2856111097. The cubic root of 43907661 is about 352.7876993336.

The spelling of 43907661 in words is "forty-three million, nine hundred seven thousand, six hundred sixty-one".