126640123 has 8 divisors (see below), whose sum is σ = 134187840. Its totient is φ = 119103360.

The previous prime is 126640121. The next prime is 126640141. The reversal of 126640123 is 321046621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 126640123 - 2¹ = 126640121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126640121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44013 + ... + 46801.

It is an arithmetic number, because the mean of its divisors is an integer number (16773480).

Almost surely, 2^126640123 is an apocalyptic number.

126640123 is a deficient number, since it is larger than the sum of its proper divisors (7547717).

126640123 is a wasteful number, since it uses less digits than its factorization.

126640123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5477.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 126640123 is about 11253.4493823005. The cubic root of 126640123 is about 502.1773353254.

Adding to 126640123 its reverse (321046621), we get a palindrome (447686744).

The spelling of 126640123 in words is "one hundred twenty-six million, six hundred forty thousand, one hundred twenty-three".