43445993 has 2 divisors, whose sum is σ = 43445994. Its totient is φ = 43445992.

The previous prime is 43445981. The next prime is 43446017. The reversal of 43445993 is 39954434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28761769 + 14684224 = 5363^2 + 3832^2 .

It is a cyclic number.

It is not a de Polignac number, because 43445993 - 2⁴ = 43445977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43445993.

It is not a weakly prime, because it can be changed into another prime (43445903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21722996 + 21722997.

It is an arithmetic number, because the mean of its divisors is an integer number (21722997).

Almost surely, 2^43445993 is an apocalyptic number.

It is an amenable number.

43445993 is a deficient number, since it is larger than the sum of its proper divisors (1).

43445993 is an equidigital number, since it uses as much as digits as its factorization.

43445993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 41.

The square root of 43445993 is about 6591.3574474459. The cubic root of 43445993 is about 351.5468757356.

The spelling of 43445993 in words is "forty-three million, four hundred forty-five thousand, nine hundred ninety-three".