128199783 has 32 divisors (see below), whose sum is σ = 187142400. Its totient is φ = 77780736.

The previous prime is 128199781. The next prime is 128199791. The reversal of 128199783 is 387991821.

It is not a de Polignac number, because 128199783 - 2¹ = 128199781 is a prime.

It is a super-2 number, since 2×128199783² = 32870368722494178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128199781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187360 + ... + 188042.

It is an arithmetic number, because the mean of its divisors is an integer number (5848200).

Almost surely, 2^128199783 is an apocalyptic number.

128199783 is a deficient number, since it is larger than the sum of its proper divisors (58942617).

128199783 is a wasteful number, since it uses less digits than its factorization.

128199783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831.

The product of its digits is 217728, while the sum is 48.

The square root of 128199783 is about 11322.5343011183. The cubic root of 128199783 is about 504.2304824198.

The spelling of 128199783 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, seven hundred eighty-three".