43723649 has 2 divisors, whose sum is σ = 43723650. Its totient is φ = 43723648.

The previous prime is 43723637. The next prime is 43723697. The reversal of 43723649 is 94632734.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 16056049 = 5260^2 + 4007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43723649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43723699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21861824 + 21861825.

It is an arithmetic number, because the mean of its divisors is an integer number (21861825).

Almost surely, 2^43723649 is an apocalyptic number.

It is an amenable number.

43723649 is a deficient number, since it is larger than the sum of its proper divisors (1).

43723649 is an equidigital number, since it uses as much as digits as its factorization.

43723649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 38.

The square root of 43723649 is about 6612.3860292636. The cubic root of 43723649 is about 352.2941782547.

The spelling of 43723649 in words is "forty-three million, seven hundred twenty-three thousand, six hundred forty-nine".