128962397 has 4 divisors (see below), whose sum is σ = 129047520. Its totient is φ = 128877276.

The previous prime is 128962381. The next prime is 128962399. The reversal of 128962397 is 793269821.

It is a happy number.

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: 793269821 = 257 ⋅3086653.

It is a cyclic number.

It is not a de Polignac number, because 128962397 - 2⁴ = 128962381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128962399) 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, 40247 + ... + 43332.

It is an arithmetic number, because the mean of its divisors is an integer number (32261880).

Almost surely, 2^128962397 is an apocalyptic number.

It is an amenable number.

128962397 is a deficient number, since it is larger than the sum of its proper divisors (85123).

128962397 is an equidigital number, since it uses as much as digits as its factorization.

128962397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85122.

The product of its digits is 326592, while the sum is 47.

The square root of 128962397 is about 11356.1611911772. The cubic root of 128962397 is about 505.2283344784.

The spelling of 128962397 in words is "one hundred twenty-eight million, nine hundred sixty-two thousand, three hundred ninety-seven".