43420649 has 2 divisors, whose sum is σ = 43420650. Its totient is φ = 43420648.

The previous prime is 43420613. The next prime is 43420651. The reversal of 43420649 is 94602434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38875225 + 4545424 = 6235^2 + 2132^2 .

It is a cyclic number.

It is not a de Polignac number, because 43420649 - 2⁸ = 43420393 is a prime.

It is a Sophie Germain prime.

Together with 43420651, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (43420679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710324 + 21710325.

It is an arithmetic number, because the mean of its divisors is an integer number (21710325).

Almost surely, 2^43420649 is an apocalyptic number.

It is an amenable number.

43420649 is a deficient number, since it is larger than the sum of its proper divisors (1).

43420649 is an equidigital number, since it uses as much as digits as its factorization.

43420649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 43420649 is about 6589.4346494976. The cubic root of 43420649 is about 351.4785047427.

The spelling of 43420649 in words is "forty-three million, four hundred twenty thousand, six hundred forty-nine".