128284199 has 4 divisors (see below), whose sum is σ = 128310120. Its totient is φ = 128258280.

The previous prime is 128284147. The next prime is 128284201. The reversal of 128284199 is 991482821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128284199 - 2⁸ = 128283943 is a prime.

It is a super-3 number, since 3×128284199³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128284399) 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, 2969 + ... + 16290.

It is an arithmetic number, because the mean of its divisors is an integer number (32077530).

Almost surely, 2^128284199 is an apocalyptic number.

128284199 is a deficient number, since it is larger than the sum of its proper divisors (25921).

128284199 is an equidigital number, since it uses as much as digits as its factorization.

128284199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25920.

The product of its digits is 82944, while the sum is 44.

The square root of 128284199 is about 11326.2614749969. The cubic root of 128284199 is about 504.3411320641.

The spelling of 128284199 in words is "one hundred twenty-eight million, two hundred eighty-four thousand, one hundred ninety-nine".