40629209 has 2 divisors, whose sum is σ = 40629210. Its totient is φ = 40629208.

The previous prime is 40629191. The next prime is 40629287. The reversal of 40629209 is 90292604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26491609 + 14137600 = 5147^2 + 3760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40629209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40629289) 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, 20314604 + 20314605.

It is an arithmetic number, because the mean of its divisors is an integer number (20314605).

Almost surely, 2^40629209 is an apocalyptic number.

It is an amenable number.

40629209 is a deficient number, since it is larger than the sum of its proper divisors (1).

40629209 is an equidigital number, since it uses as much as digits as its factorization.

40629209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 40629209 is about 6374.1045645643. The cubic root of 40629209 is about 343.7790884916.

The spelling of 40629209 in words is "forty million, six hundred twenty-nine thousand, two hundred nine".