128394993 has 16 divisors (see below), whose sum is σ = 179066880. Its totient is φ = 81677904.

The previous prime is 128394983. The next prime is 128394997. The reversal of 128394993 is 399493821.

It is not a de Polignac number, because 128394993 - 2⁸ = 128394737 is a prime.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 29938 + ... + 33956.

It is an arithmetic number, because the mean of its divisors is an integer number (11191680).

Almost surely, 2^128394993 is an apocalyptic number.

It is an amenable number.

128394993 is a deficient number, since it is larger than the sum of its proper divisors (50671887).

128394993 is a wasteful number, since it uses less digits than its factorization.

128394993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4508.

The product of its digits is 419904, while the sum is 48.

The square root of 128394993 is about 11331.1514419321. The cubic root of 128394993 is about 504.4862834624.

The spelling of 128394993 in words is "one hundred twenty-eight million, three hundred ninety-four thousand, nine hundred ninety-three".