128247965 has 4 divisors (see below), whose sum is σ = 153897564. Its totient is φ = 102598368.

The previous prime is 128247943. The next prime is 128247971. The reversal of 128247965 is 569742821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569742821 = 23 ⋅24771427.

It can be written as a sum of positive squares in 2 ways, for example, as 48288601 + 79959364 = 6949^2 + 8942^2 .

It is a cyclic number.

It is not a de Polignac number, because 128247965 - 2⁶ = 128247901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12824792 + ... + 12824801.

It is an arithmetic number, because the mean of its divisors is an integer number (38474391).

Almost surely, 2^128247965 is an apocalyptic number.

It is an amenable number.

128247965 is a deficient number, since it is larger than the sum of its proper divisors (25649599).

128247965 is an equidigital number, since it uses as much as digits as its factorization.

128247965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25649598.

The product of its digits is 241920, while the sum is 44.

The square root of 128247965 is about 11324.6618051048. The cubic root of 128247965 is about 504.2936437075.

The spelling of 128247965 in words is "one hundred twenty-eight million, two hundred forty-seven thousand, nine hundred sixty-five".