40809073 has 2 divisors, whose sum is σ = 40809074. Its totient is φ = 40809072.

The previous prime is 40809059. The next prime is 40809091. The reversal of 40809073 is 37090804.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39538944 + 1270129 = 6288^2 + 1127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40809073 is a prime.

It is not a weakly prime, because it can be changed into another prime (40809173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20404536 + 20404537.

It is an arithmetic number, because the mean of its divisors is an integer number (20404537).

Almost surely, 2^40809073 is an apocalyptic number.

It is an amenable number.

40809073 is a deficient number, since it is larger than the sum of its proper divisors (1).

40809073 is an equidigital number, since it uses as much as digits as its factorization.

40809073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 40809073 is about 6388.1979462130. The cubic root of 40809073 is about 344.2856408169.

Adding to 40809073 its reverse (37090804), we get a palindrome (77899877).

The spelling of 40809073 in words is "forty million, eight hundred nine thousand, seventy-three".