43709689 has 2 divisors, whose sum is σ = 43709690. Its totient is φ = 43709688.

The previous prime is 43709663. The next prime is 43709707. The reversal of 43709689 is 98690734.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36240400 + 7469289 = 6020^2 + 2733^2 .

It is a cyclic number.

It is not a de Polignac number, because 43709689 - 2⁵ = 43709657 is a prime.

It is not a weakly prime, because it can be changed into another prime (43709609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21854844 + 21854845.

It is an arithmetic number, because the mean of its divisors is an integer number (21854845).

Almost surely, 2^43709689 is an apocalyptic number.

It is an amenable number.

43709689 is a deficient number, since it is larger than the sum of its proper divisors (1).

43709689 is an equidigital number, since it uses as much as digits as its factorization.

43709689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 43709689 is about 6611.3303502397. The cubic root of 43709689 is about 352.2566810014.

The spelling of 43709689 in words is "forty-three million, seven hundred nine thousand, six hundred eighty-nine".