128906899 has 4 divisors (see below), whose sum is σ = 140625720. Its totient is φ = 117188080.

The previous prime is 128906879. The next prime is 128906909. The reversal of 128906899 is 998609821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 998609821 = 11 ⋅90782711.

It is a cyclic number.

It is not a de Polignac number, because 128906899 - 2⁵ = 128906867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128906879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5859394 + ... + 5859415.

It is an arithmetic number, because the mean of its divisors is an integer number (35156430).

Almost surely, 2^128906899 is an apocalyptic number.

128906899 is a deficient number, since it is larger than the sum of its proper divisors (11718821).

128906899 is a wasteful number, since it uses less digits than its factorization.

128906899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11718820.

The product of its (nonzero) digits is 559872, while the sum is 52.

The square root of 128906899 is about 11353.7174088490. The cubic root of 128906899 is about 505.1558503387.

The spelling of 128906899 in words is "one hundred twenty-eight million, nine hundred six thousand, eight hundred ninety-nine".