126123247 has 4 divisors (see below), whose sum is σ = 126504616. Its totient is φ = 125741880.

The previous prime is 126123227. The next prime is 126123271. The reversal of 126123247 is 742321621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126123247 - 2¹⁹ = 125598959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126123227) 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 in 3 ways as a sum of consecutive naturals, for example, 190188 + ... + 190849.

It is an arithmetic number, because the mean of its divisors is an integer number (31626154).

Almost surely, 2^126123247 is an apocalyptic number.

126123247 is a deficient number, since it is larger than the sum of its proper divisors (381369).

126123247 is an equidigital number, since it uses as much as digits as its factorization.

126123247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381368.

The product of its digits is 4032, while the sum is 28.

The square root of 126123247 is about 11230.4606762145. The cubic root of 126123247 is about 501.4931989414.

Adding to 126123247 its reverse (742321621), we get a palindrome (868444868).

The spelling of 126123247 in words is "one hundred twenty-six million, one hundred twenty-three thousand, two hundred forty-seven".