128388894 has 16 divisors (see below), whose sum is σ = 257846160. Its totient is φ = 42618240.

The previous prime is 128388889. The next prime is 128388899. The reversal of 128388894 is 498883821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128388889) and next prime (128388899).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128388899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42949 + ... + 45840.

It is an arithmetic number, because the mean of its divisors is an integer number (16115385).

Almost surely, 2^128388894 is an apocalyptic number.

128388894 is an abundant number, since it is smaller than the sum of its proper divisors (129457266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128388894 is a wasteful number, since it uses less digits than its factorization.

128388894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89035.

The product of its digits is 884736, while the sum is 51.

The square root of 128388894 is about 11330.8823133947. The cubic root of 128388894 is about 504.4782953249.

The spelling of 128388894 in words is "one hundred twenty-eight million, three hundred eighty-eight thousand, eight hundred ninety-four".