128238442 has 4 divisors (see below), whose sum is σ = 192357666. Its totient is φ = 64119220.

The previous prime is 128238437. The next prime is 128238479. The reversal of 128238442 is 244832821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 81739681 + 46498761 = 9041^2 + 6819^2 .

It is a junction number, because it is equal to n+sod(n) for n = 128238398 and 128238407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32059609 + ... + 32059612.

Almost surely, 2^128238442 is an apocalyptic number.

128238442 is a deficient number, since it is larger than the sum of its proper divisors (64119224).

128238442 is an equidigital number, since it uses as much as digits as its factorization.

128238442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64119223.

The product of its digits is 24576, while the sum is 34.

The square root of 128238442 is about 11324.2413432424. The cubic root of 128238442 is about 504.2811613594.

The spelling of 128238442 in words is "one hundred twenty-eight million, two hundred thirty-eight thousand, four hundred forty-two".