126928123 has 4 divisors (see below), whose sum is σ = 145060720. Its totient is φ = 108795528.

The previous prime is 126928121. The next prime is 126928133. The reversal of 126928123 is 321829621.

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 126928123 - 2¹ = 126928121 is a prime.

It is a super-5 number, since 5×126928123⁵ (a number of 42 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (126928121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9066288 + ... + 9066301.

It is an arithmetic number, because the mean of its divisors is an integer number (36265180).

Almost surely, 2^126928123 is an apocalyptic number.

126928123 is a deficient number, since it is larger than the sum of its proper divisors (18132597).

126928123 is an equidigital number, since it uses as much as digits as its factorization.

126928123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18132596.

The product of its digits is 10368, while the sum is 34.

The square root of 126928123 is about 11266.2381920497. The cubic root of 126928123 is about 502.5577244479.

It can be divided in two parts, 1269 and 28123, that added together give a palindrome (29392).

The spelling of 126928123 in words is "one hundred twenty-six million, nine hundred twenty-eight thousand, one hundred twenty-three".