43209073 has 2 divisors, whose sum is σ = 43209074. Its totient is φ = 43209072.

The previous prime is 43209031. The next prime is 43209077. The reversal of 43209073 is 37090234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34845409 + 8363664 = 5903^2 + 2892^2 .

It is a cyclic number.

It is not a de Polignac number, because 43209073 - 2¹³ = 43200881 is a prime.

It is equal to p_2616436 and since 43209073 and 2616436 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (43209077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21604536 + 21604537.

It is an arithmetic number, because the mean of its divisors is an integer number (21604537).

Almost surely, 2^43209073 is an apocalyptic number.

It is an amenable number.

43209073 is a deficient number, since it is larger than the sum of its proper divisors (1).

43209073 is an equidigital number, since it uses as much as digits as its factorization.

43209073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 43209073 is about 6573.3608603210. The cubic root of 43209073 is about 350.9066913225.

The spelling of 43209073 in words is "forty-three million, two hundred nine thousand, seventy-three".