128422387 has 8 divisors (see below), whose sum is σ = 135468800. Its totient is φ = 121404744.

The previous prime is 128422351. The next prime is 128422397. The reversal of 128422387 is 783224821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(128422387) divides (128422387-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 128422387 - 2¹⁵ = 128389619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128422397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2314 + ... + 16192.

It is an arithmetic number, because the mean of its divisors is an integer number (16933600).

Almost surely, 2^128422387 is an apocalyptic number.

128422387 is the 9253-rd pentagonal number.

128422387 is a deficient number, since it is larger than the sum of its proper divisors (7046413).

128422387 is a wasteful number, since it uses less digits than its factorization.

128422387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14385.

The product of its digits is 43008, while the sum is 37.

The square root of 128422387 is about 11332.3601690027. The cubic root of 128422387 is about 504.5221595096.

The spelling of 128422387 in words is "one hundred twenty-eight million, four hundred twenty-two thousand, three hundred eighty-seven".