40040509 has 2 divisors, whose sum is σ = 40040510. Its totient is φ = 40040508.

The previous prime is 40040489. The next prime is 40040513. The reversal of 40040509 is 90504004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39312900 + 727609 = 6270^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 40040509 - 2¹⁷ = 39909437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40040509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40044509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20020254 + 20020255.

It is an arithmetic number, because the mean of its divisors is an integer number (20020255).

Almost surely, 2^40040509 is an apocalyptic number.

It is an amenable number.

40040509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40040509 is an equidigital number, since it uses as much as digits as its factorization.

40040509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 40040509 is about 6327.7570275730. The cubic root of 40040509 is about 342.1105994106.

The spelling of 40040509 in words is "forty million, forty thousand, five hundred nine".