128697 has 4 divisors (see below), whose sum is σ = 171600. Its totient is φ = 85796.

The previous prime is 128693. The next prime is 128717. The reversal of 128697 is 796821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 796821 = 3 ⋅265607.

It is a cyclic number.

It is not a de Polignac number, because 128697 - 2² = 128693 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128697.

It is not an unprimeable number, because it can be changed into a prime (128693) 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, 21447 + ... + 21452.

It is an arithmetic number, because the mean of its divisors is an integer number (42900).

2¹²⁸⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

128697 is a deficient number, since it is larger than the sum of its proper divisors (42903).

128697 is an equidigital number, since it uses as much as digits as its factorization.

128697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42902.

The product of its digits is 6048, while the sum is 33.

The square root of 128697 is about 358.7436410586. The cubic root of 128697 is about 50.4881519766.

The spelling of 128697 in words is "one hundred twenty-eight thousand, six hundred ninety-seven".