40210109 has 2 divisors, whose sum is σ = 40210110. Its totient is φ = 40210108.

The previous prime is 40210103. The next prime is 40210133. The reversal of 40210109 is 90101204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33605209 + 6604900 = 5797^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 40210109 - 2⁸ = 40209853 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 (40210103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20105054 + 20105055.

It is an arithmetic number, because the mean of its divisors is an integer number (20105055).

Almost surely, 2^40210109 is an apocalyptic number.

It is an amenable number.

40210109 is a deficient number, since it is larger than the sum of its proper divisors (1).

40210109 is an equidigital number, since it uses as much as digits as its factorization.

40210109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 40210109 is about 6341.1441396644. The cubic root of 40210109 is about 342.5929461634.

The spelling of 40210109 in words is "forty million, two hundred ten thousand, one hundred nine".