128436899 has 8 divisors (see below), whose sum is σ = 134330400. Its totient is φ = 122569216.

The previous prime is 128436883. The next prime is 128436901. The reversal of 128436899 is 998634821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 128436899 - 2⁴ = 128436883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128436809) 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, 4109 + ... + 16545.

It is an arithmetic number, because the mean of its divisors is an integer number (16791300).

Almost surely, 2^128436899 is an apocalyptic number.

128436899 is a deficient number, since it is larger than the sum of its proper divisors (5893501).

128436899 is a wasteful number, since it uses less digits than its factorization.

128436899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12909.

The product of its digits is 746496, while the sum is 50.

The square root of 128436899 is about 11333.0004411894. Note that the first 3 decimals coincide. The cubic root of 128436899 is about 504.5411628158.

It can be divided in two parts, 1284 and 36899, that added together give a palindrome (38183).

The spelling of 128436899 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, eight hundred ninety-nine".