128415994 has 32 divisors (see below), whose sum is σ = 234023040. Its totient is φ = 51770304.

The previous prime is 128415967. The next prime is 128416009. The reversal of 128415994 is 499514821.

It is a self number, because there is not a number n which added to its sum of digits gives 128415994.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67849 + ... + 69715.

It is an arithmetic number, because the mean of its divisors is an integer number (7313220).

Almost surely, 2^128415994 is an apocalyptic number.

128415994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

128415994 is a deficient number, since it is larger than the sum of its proper divisors (105607046).

128415994 is an equidigital number, since it uses as much as digits as its factorization.

128415994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927 (or 1893 counting only the distinct ones).

The product of its digits is 103680, while the sum is 43.

The square root of 128415994 is about 11332.0780971541. The cubic root of 128415994 is about 504.5137874914.

The spelling of 128415994 in words is "one hundred twenty-eight million, four hundred fifteen thousand, nine hundred ninety-four".