128974155 has 16 divisors (see below), whose sum is σ = 218497824. Its totient is φ = 64739840.

The previous prime is 128974093. The next prime is 128974159. The reversal of 128974155 is 551479821.

It is not a de Polignac number, because 128974155 - 2¹² = 128970059 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (128974159) 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, 252636 + ... + 253145.

It is an arithmetic number, because the mean of its divisors is an integer number (13656114).

Almost surely, 2^128974155 is an apocalyptic number.

128974155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128974155 is a deficient number, since it is larger than the sum of its proper divisors (89523669).

128974155 is a wasteful number, since it uses less digits than its factorization.

128974155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505806.

The product of its digits is 100800, while the sum is 42.

The square root of 128974155 is about 11356.6788719238. The cubic root of 128974155 is about 505.2436885516.

The spelling of 128974155 in words is "one hundred twenty-eight million, nine hundred seventy-four thousand, one hundred fifty-five".