128396834 has 4 divisors (see below), whose sum is σ = 192595254. Its totient is φ = 64198416.

The previous prime is 128396759. The next prime is 128396837. The reversal of 128396834 is 438693821.

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., 124255609 + 4141225 = 11147^2 + 2035^2 .

It is not an unprimeable number, because it can be changed into a prime (128396837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32099207 + ... + 32099210.

Almost surely, 2^128396834 is an apocalyptic number.

128396834 is a deficient number, since it is larger than the sum of its proper divisors (64198420).

128396834 is an equidigital number, since it uses as much as digits as its factorization.

128396834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64198419.

The product of its digits is 248832, while the sum is 44.

The square root of 128396834 is about 11331.2326778687. The cubic root of 128396834 is about 504.4886946540.

The spelling of 128396834 in words is "one hundred twenty-eight million, three hundred ninety-six thousand, eight hundred thirty-four".