43997409 has 12 divisors (see below), whose sum is σ = 64594452. Its totient is φ = 28850400.

The previous prime is 43997353. The next prime is 43997419. The reversal of 43997409 is 90479934.

It can be written as a sum of positive squares in 2 ways, for example, as 7273809 + 36723600 = 2697^2 + 6060^2 .

It is not a de Polignac number, because 43997409 - 2⁷ = 43997281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43997419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39522 + ... + 40619.

It is an arithmetic number, because the mean of its divisors is an integer number (5382871).

Almost surely, 2^43997409 is an apocalyptic number.

It is an amenable number.

43997409 is a deficient number, since it is larger than the sum of its proper divisors (20597043).

43997409 is a wasteful number, since it uses less digits than its factorization.

43997409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80208 (or 80205 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 43997409 is about 6633.0542738621. The cubic root of 43997409 is about 353.0279037507.

The spelling of 43997409 in words is "forty-three million, nine hundred ninety-seven thousand, four hundred nine".