128422930 has 48 divisors (see below), whose sum is σ = 252405576. Its totient is φ = 47001600.

The previous prime is 128422927. The next prime is 128422937. The reversal of 128422930 is 39224821.

It can be written as a sum of positive squares in 12 ways, for example, as 26594649 + 101828281 = 5157^2 + 10091^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128422892 and 128422901.

It is not an unprimeable number, because it can be changed into a prime (128422937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106330 + ... + 107530.

Almost surely, 2^128422930 is an apocalyptic number.

128422930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128422930 is a deficient number, since it is larger than the sum of its proper divisors (123982646).

128422930 is a wasteful number, since it uses less digits than its factorization.

128422930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 128422930 is about 11332.3841269170. The cubic root of 128422930 is about 504.5228705880.

The spelling of 128422930 in words is "one hundred twenty-eight million, four hundred twenty-two thousand, nine hundred thirty".