128938518 has 12 divisors (see below), whose sum is σ = 279366828. Its totient is φ = 42979500.

The previous prime is 128938501. The next prime is 128938543. The reversal of 128938518 is 815839821.

It is a happy number.

128938518 is a `hidden beast` number, since 128 + 9 + 3 + 8 + 518 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3581608 + ... + 3581643.

It is an arithmetic number, because the mean of its divisors is an integer number (23280569).

Almost surely, 2^128938518 is an apocalyptic number.

128938518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

128938518 is an abundant number, since it is smaller than the sum of its proper divisors (150428310).

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

128938518 is a wasteful number, since it uses less digits than its factorization.

128938518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7163259 (or 7163256 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 128938518 is about 11355.1097748987. The cubic root of 128938518 is about 505.1971494396.

The spelling of 128938518 in words is "one hundred twenty-eight million, nine hundred thirty-eight thousand, five hundred eighteen".