43649449 has 2 divisors, whose sum is σ = 43649450. Its totient is φ = 43649448.

The previous prime is 43649399. The next prime is 43649453. The reversal of 43649449 is 94494634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27489049 + 16160400 = 5243^2 + 4020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43649449 is a prime.

It is not a weakly prime, because it can be changed into another prime (43649549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21824724 + 21824725.

It is an arithmetic number, because the mean of its divisors is an integer number (21824725).

Almost surely, 2^43649449 is an apocalyptic number.

It is an amenable number.

43649449 is a deficient number, since it is larger than the sum of its proper divisors (1).

43649449 is an equidigital number, since it uses as much as digits as its factorization.

43649449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 43.

The square root of 43649449 is about 6606.7729641634. The cubic root of 43649449 is about 352.0947817463.

The spelling of 43649449 in words is "forty-three million, six hundred forty-nine thousand, four hundred forty-nine".