43966009 has 4 divisors (see below), whose sum is σ = 44901504. Its totient is φ = 43030516.

The previous prime is 43965997. The next prime is 43966067. The reversal of 43966009 is 90066934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90066934 = 2 ⋅45033467.

It is a cyclic number.

It is not a de Polignac number, because 43966009 - 2¹³ = 43957817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43966079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467677 + ... + 467770.

It is an arithmetic number, because the mean of its divisors is an integer number (11225376).

Almost surely, 2^43966009 is an apocalyptic number.

It is an amenable number.

43966009 is a deficient number, since it is larger than the sum of its proper divisors (935495).

43966009 is an equidigital number, since it uses as much as digits as its factorization.

43966009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935494.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 43966009 is about 6630.6869176579. The cubic root of 43966009 is about 352.9439009686.

The spelling of 43966009 in words is "forty-three million, nine hundred sixty-six thousand, nine".