128847397 has 4 divisors (see below), whose sum is σ = 147254176. Its totient is φ = 110440620.

The previous prime is 128847391. The next prime is 128847401. The reversal of 128847397 is 793748821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128847397 - 2⁷ = 128847269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128847397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128847391) 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, 9203379 + ... + 9203392.

It is an arithmetic number, because the mean of its divisors is an integer number (36813544).

Almost surely, 2^128847397 is an apocalyptic number.

It is an amenable number.

128847397 is a deficient number, since it is larger than the sum of its proper divisors (18406779).

128847397 is an equidigital number, since it uses as much as digits as its factorization.

128847397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18406778.

The product of its digits is 677376, while the sum is 49.

The square root of 128847397 is about 11351.0967311533. The cubic root of 128847397 is about 505.0781135907.

The spelling of 128847397 in words is "one hundred twenty-eight million, eight hundred forty-seven thousand, three hundred ninety-seven".