128394994 has 48 divisors (see below), whose sum is σ = 249129216. Its totient is φ = 49140000.

The previous prime is 128394983. The next prime is 128394997. The reversal of 128394994 is 499493821.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (128394997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37869 + ... + 41119.

It is an arithmetic number, because the mean of its divisors is an integer number (5190192).

Almost surely, 2^128394994 is an apocalyptic number.

128394994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

128394994 is a deficient number, since it is larger than the sum of its proper divisors (120734222).

128394994 is a wasteful number, since it uses less digits than its factorization.

128394994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311 (or 3304 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 128394994 is about 11331.1514860582. The cubic root of 128394994 is about 504.4862847721.

The spelling of 128394994 in words is "one hundred twenty-eight million, three hundred ninety-four thousand, nine hundred ninety-four".