126728369 has 2 divisors, whose sum is σ = 126728370. Its totient is φ = 126728368.

The previous prime is 126728333. The next prime is 126728429. The reversal of 126728369 is 963827621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94090000 + 32638369 = 9700^2 + 5713^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126728369 is a prime.

It is a super-2 number, since 2×126728369² = 32120159018800322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (126728669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63364184 + 63364185.

It is an arithmetic number, because the mean of its divisors is an integer number (63364185).

Almost surely, 2^126728369 is an apocalyptic number.

It is an amenable number.

126728369 is a deficient number, since it is larger than the sum of its proper divisors (1).

126728369 is an equidigital number, since it uses as much as digits as its factorization.

126728369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 44.

The square root of 126728369 is about 11257.3695417713. The cubic root of 126728369 is about 502.2939514782.

The spelling of 126728369 in words is "one hundred twenty-six million, seven hundred twenty-eight thousand, three hundred sixty-nine".