43394809 has 2 divisors, whose sum is σ = 43394810. Its totient is φ = 43394808.

The previous prime is 43394789. The next prime is 43394831. The reversal of 43394809 is 90849334.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32319225 + 11075584 = 5685^2 + 3328^2 .

It is a cyclic number.

It is not a de Polignac number, because 43394809 - 2⁹ = 43394297 is a prime.

It is not a weakly prime, because it can be changed into another prime (43394509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21697404 + 21697405.

It is an arithmetic number, because the mean of its divisors is an integer number (21697405).

Almost surely, 2^43394809 is an apocalyptic number.

It is an amenable number.

43394809 is a deficient number, since it is larger than the sum of its proper divisors (1).

43394809 is an equidigital number, since it uses as much as digits as its factorization.

43394809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 43394809 is about 6587.4736432110. The cubic root of 43394809 is about 351.4087682847.

The spelling of 43394809 in words is "forty-three million, three hundred ninety-four thousand, eight hundred nine".