128458423 has 2 divisors, whose sum is σ = 128458424. Its totient is φ = 128458422.

The previous prime is 128458403. The next prime is 128458433. The reversal of 128458423 is 324854821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128458423 - 2⁵ = 128458391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128458403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64229211 + 64229212.

It is an arithmetic number, because the mean of its divisors is an integer number (64229212).

Almost surely, 2^128458423 is an apocalyptic number.

128458423 is a deficient number, since it is larger than the sum of its proper divisors (1).

128458423 is an equidigital number, since it uses as much as digits as its factorization.

128458423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61440, while the sum is 37.

The square root of 128458423 is about 11333.9500175358. The cubic root of 128458423 is about 504.5693456238.

It can be divided in two parts, 128458 and 423, that added together give a square (128881 = 359²).

The spelling of 128458423 in words is "one hundred twenty-eight million, four hundred fifty-eight thousand, four hundred twenty-three".