40228709 has 2 divisors, whose sum is σ = 40228710. Its totient is φ = 40228708.

The previous prime is 40228703. The next prime is 40228711. The reversal of 40228709 is 90782204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34692100 + 5536609 = 5890^2 + 2353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40228709 is a prime.

Together with 40228711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40228703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20114354 + 20114355.

It is an arithmetic number, because the mean of its divisors is an integer number (20114355).

Almost surely, 2^40228709 is an apocalyptic number.

It is an amenable number.

40228709 is a deficient number, since it is larger than the sum of its proper divisors (1).

40228709 is an equidigital number, since it uses as much as digits as its factorization.

40228709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 40228709 is about 6342.6105824022. The cubic root of 40228709 is about 342.6457624549.

The spelling of 40228709 in words is "forty million, two hundred twenty-eight thousand, seven hundred nine".