128417397 has 4 divisors (see below), whose sum is σ = 171223200. Its totient is φ = 85611596.

The previous prime is 128417389. The next prime is 128417459. The reversal of 128417397 is 793714821.

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 128417397 - 2³ = 128417389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128417197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21402897 + ... + 21402902.

It is an arithmetic number, because the mean of its divisors is an integer number (42805800).

Almost surely, 2^128417397 is an apocalyptic number.

It is an amenable number.

128417397 is a deficient number, since it is larger than the sum of its proper divisors (42805803).

128417397 is an equidigital number, since it uses as much as digits as its factorization.

128417397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42805802.

The product of its digits is 84672, while the sum is 42.

The square root of 128417397 is about 11332.1400009001. The cubic root of 128417397 is about 504.5156248281.

It can be divided in two parts, 1284 and 17397, that added together give a palindrome (18681).

The spelling of 128417397 in words is "one hundred twenty-eight million, four hundred seventeen thousand, three hundred ninety-seven".