43399973 has 2 divisors, whose sum is σ = 43399974. Its totient is φ = 43399972.

The previous prime is 43399931. The next prime is 43400051. The reversal of 43399973 is 37999334.

43399973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38725729 + 4674244 = 6223^2 + 2162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43399973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43399913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21699986 + 21699987.

It is an arithmetic number, because the mean of its divisors is an integer number (21699987).

Almost surely, 2^43399973 is an apocalyptic number.

It is an amenable number.

43399973 is a deficient number, since it is larger than the sum of its proper divisors (1).

43399973 is an equidigital number, since it uses as much as digits as its factorization.

43399973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 551124, while the sum is 47.

The square root of 43399973 is about 6587.8655875784. The cubic root of 43399973 is about 351.4227069942.

The spelling of 43399973 in words is "forty-three million, three hundred ninety-nine thousand, nine hundred seventy-three".