128185849 has 8 divisors (see below), whose sum is σ = 140021280. Its totient is φ = 116380800.

The previous prime is 128185847. The next prime is 128185879. The reversal of 128185849 is 948581821.

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 128185849 - 2¹ = 128185847 is a prime.

It is a super-2 number, since 2×128185849² = 32863223767701602, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128185799 and 128185808.

It is not an unprimeable number, because it can be changed into a prime (128185847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1737 + ... + 16105.

It is an arithmetic number, because the mean of its divisors is an integer number (17502660).

Almost surely, 2^128185849 is an apocalyptic number.

It is an amenable number.

128185849 is a deficient number, since it is larger than the sum of its proper divisors (11835431).

128185849 is a wasteful number, since it uses less digits than its factorization.

128185849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15191.

The product of its digits is 184320, while the sum is 46.

The square root of 128185849 is about 11321.9189627907. The cubic root of 128185849 is about 504.2122135327.

The spelling of 128185849 in words is "one hundred twenty-eight million, one hundred eighty-five thousand, eight hundred forty-nine".