40607309 has 2 divisors, whose sum is σ = 40607310. Its totient is φ = 40607308.

The previous prime is 40607299. The next prime is 40607317. The reversal of 40607309 is 90370604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31922500 + 8684809 = 5650^2 + 2947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40607309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40607209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20303654 + 20303655.

It is an arithmetic number, because the mean of its divisors is an integer number (20303655).

Almost surely, 2^40607309 is an apocalyptic number.

It is an amenable number.

40607309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40607309 is an equidigital number, since it uses as much as digits as its factorization.

40607309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 40607309 is about 6372.3864446532. The cubic root of 40607309 is about 343.7173093320.

The spelling of 40607309 in words is "forty million, six hundred seven thousand, three hundred nine".