128398426 has 12 divisors (see below), whose sum is σ = 208553022. Its totient is φ = 59260656.

The previous prime is 128398421. The next prime is 128398453. The reversal of 128398426 is 624893821.

It can be written as a sum of positive squares in 3 ways, for example, as 74390625 + 54007801 = 8625^2 + 7349^2 .

It is not an unprimeable number, because it can be changed into a prime (128398421) 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, 189601 + ... + 190276.

Almost surely, 2^128398426 is an apocalyptic number.

128398426 is a deficient number, since it is larger than the sum of its proper divisors (80154596).

128398426 is a wasteful number, since it uses less digits than its factorization.

128398426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379905 (or 379892 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 128398426 is about 11331.3029259658. The cubic root of 128398426 is about 504.4907797072.

The spelling of 128398426 in words is "one hundred twenty-eight million, three hundred ninety-eight thousand, four hundred twenty-six".