43997489 has 2 divisors, whose sum is σ = 43997490. Its totient is φ = 43997488.

The previous prime is 43997467. The next prime is 43997491. The reversal of 43997489 is 98479934.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26214400 + 17783089 = 5120^2 + 4217^2 .

It is a cyclic number.

It is not a de Polignac number, because 43997489 - 2¹² = 43993393 is a prime.

Together with 43997491, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43997489.

It is not a weakly prime, because it can be changed into another prime (43997419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21998744 + 21998745.

It is an arithmetic number, because the mean of its divisors is an integer number (21998745).

Almost surely, 2^43997489 is an apocalyptic number.

It is an amenable number.

43997489 is a deficient number, since it is larger than the sum of its proper divisors (1).

43997489 is an equidigital number, since it uses as much as digits as its factorization.

43997489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 43997489 is about 6633.0603042638. The cubic root of 43997489 is about 353.0281177195.

The spelling of 43997489 in words is "forty-three million, nine hundred ninety-seven thousand, four hundred eighty-nine".