43390073 has 2 divisors, whose sum is σ = 43390074. Its totient is φ = 43390072.

The previous prime is 43390057. The next prime is 43390097. The reversal of 43390073 is 37009334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32684089 + 10705984 = 5717^2 + 3272^2 .

It is a cyclic number.

It is not a de Polignac number, because 43390073 - 2⁴ = 43390057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (43395073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21695036 + 21695037.

It is an arithmetic number, because the mean of its divisors is an integer number (21695037).

Almost surely, 2^43390073 is an apocalyptic number.

It is an amenable number.

43390073 is a deficient number, since it is larger than the sum of its proper divisors (1).

43390073 is an equidigital number, since it uses as much as digits as its factorization.

43390073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 29.

The square root of 43390073 is about 6587.1141632736. The cubic root of 43390073 is about 351.3959838641.

The spelling of 43390073 in words is "forty-three million, three hundred ninety thousand, seventy-three".