128906023 has 4 divisors (see below), whose sum is σ = 128961648. Its totient is φ = 128850400.

The previous prime is 128906021. The next prime is 128906027. The reversal of 128906023 is 320609821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320609821 = 7 ⋅45801403.

It is a cyclic number.

It is not a de Polignac number, because 128906023 - 2¹ = 128906021 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 (128906021) 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, 24178 + ... + 29023.

It is an arithmetic number, because the mean of its divisors is an integer number (32240412).

Almost surely, 2^128906023 is an apocalyptic number.

128906023 is a deficient number, since it is larger than the sum of its proper divisors (55625).

128906023 is an equidigital number, since it uses as much as digits as its factorization.

128906023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55624.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 128906023 is about 11353.6788311102. The cubic root of 128906023 is about 505.1547060567.

The spelling of 128906023 in words is "one hundred twenty-eight million, nine hundred six thousand, twenty-three".