126940123 has 4 divisors (see below), whose sum is σ = 128547040. Its totient is φ = 125333208.

The previous prime is 126940109. The next prime is 126940129. The reversal of 126940123 is 321049621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126940123 is a prime.

It is a super-2 number, since 2×126940123² = 32227589654510258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126940091 and 126940100.

It is not an unprimeable number, because it can be changed into a prime (126940129) 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, 803340 + ... + 803497.

It is an arithmetic number, because the mean of its divisors is an integer number (32136760).

Almost surely, 2^126940123 is an apocalyptic number.

126940123 is a deficient number, since it is larger than the sum of its proper divisors (1606917).

126940123 is an equidigital number, since it uses as much as digits as its factorization.

126940123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606916.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 126940123 is about 11266.7707440952. The cubic root of 126940123 is about 502.5735615020.

Adding to 126940123 its reverse (321049621), we get a palindrome (447989744).

The spelling of 126940123 in words is "one hundred twenty-six million, nine hundred forty thousand, one hundred twenty-three".