128917974 has 16 divisors (see below), whose sum is σ = 259262640. Its totient is φ = 42734880.

The previous prime is 128917939. The next prime is 128917979. The reversal of 128917974 is 479719821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128917979) 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, 58269 + ... + 60440.

It is an arithmetic number, because the mean of its divisors is an integer number (16203915).

Almost surely, 2^128917974 is an apocalyptic number.

128917974 is an abundant number, since it is smaller than the sum of its proper divisors (130344666).

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

128917974 is a wasteful number, since it uses less digits than its factorization.

128917974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118895.

The product of its digits is 254016, while the sum is 48.

The square root of 128917974 is about 11354.2051240939. The cubic root of 128917974 is about 505.1703166987.

The spelling of 128917974 in words is "one hundred twenty-eight million, nine hundred seventeen thousand, nine hundred seventy-four".