40558009 has 2 divisors, whose sum is σ = 40558010. Its totient is φ = 40558008.

The previous prime is 40557983. The next prime is 40558057. The reversal of 40558009 is 90085504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39501225 + 1056784 = 6285^2 + 1028^2 .

It is a cyclic number.

It is not a de Polignac number, because 40558009 - 2⁵ = 40557977 is a prime.

It is not a weakly prime, because it can be changed into another prime (40558069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20279004 + 20279005.

It is an arithmetic number, because the mean of its divisors is an integer number (20279005).

Almost surely, 2^40558009 is an apocalyptic number.

It is an amenable number.

40558009 is a deficient number, since it is larger than the sum of its proper divisors (1).

40558009 is an equidigital number, since it uses as much as digits as its factorization.

40558009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 40558009 is about 6368.5170173283. The cubic root of 40558009 is about 343.5781543706.

The spelling of 40558009 in words is "forty million, five hundred fifty-eight thousand, nine".