128621423 has 6 divisors (see below), whose sum is σ = 149620896. Its totient is φ = 110246892.

The previous prime is 128621413. The next prime is 128621447. The reversal of 128621423 is 324126821.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-128621423 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 (128621413) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1312415 + ... + 1312512.

It is an arithmetic number, because the mean of its divisors is an integer number (24936816).

Almost surely, 2^128621423 is an apocalyptic number.

128621423 is a deficient number, since it is larger than the sum of its proper divisors (20999473).

128621423 is an equidigital number, since it uses as much as digits as its factorization.

128621423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624941 (or 2624934 counting only the distinct ones).

The product of its digits is 4608, while the sum is 29.

The square root of 128621423 is about 11341.1385230937. The cubic root of 128621423 is about 504.7826702656.

The spelling of 128621423 in words is "one hundred twenty-eight million, six hundred twenty-one thousand, four hundred twenty-three".