43399409 has 4 divisors (see below), whose sum is σ = 44572404. Its totient is φ = 42226416.

The previous prime is 43399403. The next prime is 43399417. The reversal of 43399409 is 90499334.

It is a happy number.

43399409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90499334 = 2 ⋅45249667.

It can be written as a sum of positive squares in 2 ways, for example, as 24039409 + 19360000 = 4903^2 + 4400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43399409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43399403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586442 + ... + 586515.

It is an arithmetic number, because the mean of its divisors is an integer number (11143101).

Almost surely, 2^43399409 is an apocalyptic number.

It is an amenable number.

43399409 is a deficient number, since it is larger than the sum of its proper divisors (1172995).

43399409 is a wasteful number, since it uses less digits than its factorization.

43399409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172994.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 43399409 is about 6587.8227814658. The cubic root of 43399409 is about 351.4211846947.

The spelling of 43399409 in words is "forty-three million, three hundred ninety-nine thousand, four hundred nine".