128900123 has 16 divisors (see below), whose sum is σ = 148400640. Its totient is φ = 110728800.

The previous prime is 128900063. The next prime is 128900143. The reversal of 128900123 is 321009821.

It is a cyclic number.

It is not a de Polignac number, because 128900123 - 2⁶ = 128900059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128900092 and 128900101.

It is not an unprimeable number, because it can be changed into a prime (128900143) 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 15 ways as a sum of consecutive naturals, for example, 141038 + ... + 141948.

It is an arithmetic number, because the mean of its divisors is an integer number (9275040).

Almost surely, 2^128900123 is an apocalyptic number.

128900123 is a deficient number, since it is larger than the sum of its proper divisors (19500517).

128900123 is a wasteful number, since it uses less digits than its factorization.

128900123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 128900123 is about 11353.4190004597. The cubic root of 128900123 is about 505.1469989996.

Adding to 128900123 its reverse (321009821), we get a palindrome (449909944).

The spelling of 128900123 in words is "one hundred twenty-eight million, nine hundred thousand, one hundred twenty-three".