128199933 has 6 divisors (see below), whose sum is σ = 185177694. Its totient is φ = 85466616.

The previous prime is 128199893. The next prime is 128199937. The reversal of 128199933 is 339991821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 94536729 + 33663204 = 9723^2 + 5802^2 .

It is not a de Polignac number, because 128199933 - 2¹³ = 128191741 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128199937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7122210 + ... + 7122227.

It is an arithmetic number, because the mean of its divisors is an integer number (30862949).

Almost surely, 2^128199933 is an apocalyptic number.

It is an amenable number.

128199933 is a deficient number, since it is larger than the sum of its proper divisors (56977761).

128199933 is a wasteful number, since it uses less digits than its factorization.

128199933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14244443 (or 14244440 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 128199933 is about 11322.5409250751. The cubic root of 128199933 is about 504.2306790778.

The spelling of 128199933 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, nine hundred thirty-three".