40615409 has 2 divisors, whose sum is σ = 40615410. Its totient is φ = 40615408.

The previous prime is 40615403. The next prime is 40615411. The reversal of 40615409 is 90451604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35664784 + 4950625 = 5972^2 + 2225^2 .

It is a cyclic number.

It is not a de Polignac number, because 40615409 - 2⁸ = 40615153 is a prime.

It is a super-2 number, since 2×40615409² = 3299222896474562, which contains 22 as substring.

Together with 40615411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40615403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20307704 + 20307705.

It is an arithmetic number, because the mean of its divisors is an integer number (20307705).

Almost surely, 2^40615409 is an apocalyptic number.

It is an amenable number.

40615409 is a deficient number, since it is larger than the sum of its proper divisors (1).

40615409 is an equidigital number, since it uses as much as digits as its factorization.

40615409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40615409 is about 6373.0219676383. The cubic root of 40615409 is about 343.7401617460.

The spelling of 40615409 in words is "forty million, six hundred fifteen thousand, four hundred nine".