128040211 has 4 divisors (see below), whose sum is σ = 137889472. Its totient is φ = 118190952.

The previous prime is 128040181. The next prime is 128040217. The reversal of 128040211 is 112040821.

It is a happy number.

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 128040211 - 2¹³ = 128032019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128040217) 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, 4924611 + ... + 4924636.

It is an arithmetic number, because the mean of its divisors is an integer number (34472368).

Almost surely, 2^128040211 is an apocalyptic number.

128040211 is a deficient number, since it is larger than the sum of its proper divisors (9849261).

128040211 is an equidigital number, since it uses as much as digits as its factorization.

128040211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9849260.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 128040211 is about 11315.4854513627. The cubic root of 128040211 is about 504.0211880632.

The spelling of 128040211 in words is "one hundred twenty-eight million, forty thousand, two hundred eleven".