128700394 has 8 divisors (see below), whose sum is σ = 197759268. Its totient is φ = 62780640.

The previous prime is 128700391. The next prime is 128700431. The reversal of 128700394 is 493007821.

It can be written as a sum of positive squares in 2 ways, for example, as 98307225 + 30393169 = 9915^2 + 5513^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (128700391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784677 + ... + 784840.

Almost surely, 2^128700394 is an apocalyptic number.

128700394 is a deficient number, since it is larger than the sum of its proper divisors (69058874).

128700394 is a wasteful number, since it uses less digits than its factorization.

128700394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569560.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 128700394 is about 11344.6196057867. The cubic root of 128700394 is about 504.8859579754.

The spelling of 128700394 in words is "one hundred twenty-eight million, seven hundred thousand, three hundred ninety-four".