128236842 has 12 divisors (see below), whose sum is σ = 277846530. Its totient is φ = 42745608.

The previous prime is 128236841. The next prime is 128236859. The reversal of 128236842 is 248632821.

It can be written as a sum of positive squares in only one way, i.e., 73462041 + 54774801 = 8571^2 + 7401^2 .

It is a super-2 number, since 2×128236842² = 32889375292265928, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128236797 and 128236806.

It is not an unprimeable number, because it can be changed into a prime (128236841) 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, 3562117 + ... + 3562152.

Almost surely, 2^128236842 is an apocalyptic number.

128236842 is an abundant number, since it is smaller than the sum of its proper divisors (149609688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128236842 is a wasteful number, since it uses less digits than its factorization.

128236842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124277 (or 7124274 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 128236842 is about 11324.1706981130. The cubic root of 128236842 is about 504.2790640860.

The spelling of 128236842 in words is "one hundred twenty-eight million, two hundred thirty-six thousand, eight hundred forty-two".