126938209 has 2 divisors, whose sum is σ = 126938210. Its totient is φ = 126938208.

The previous prime is 126938197. The next prime is 126938213. The reversal of 126938209 is 902839621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111767184 + 15171025 = 10572^2 + 3895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126938209 is a prime.

It is a super-2 number, since 2×126938209² = 32226617808255362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126938299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63469104 + 63469105.

It is an arithmetic number, because the mean of its divisors is an integer number (63469105).

Almost surely, 2^126938209 is an apocalyptic number.

It is an amenable number.

126938209 is a deficient number, since it is larger than the sum of its proper divisors (1).

126938209 is an equidigital number, since it uses as much as digits as its factorization.

126938209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 126938209 is about 11266.6858037313. The cubic root of 126938209 is about 502.5710355588.

It can be divided in two parts, 12693 and 8209, that added together give a palindrome (20902).

The spelling of 126938209 in words is "one hundred twenty-six million, nine hundred thirty-eight thousand, two hundred nine".