128396773 has 4 divisors (see below), whose sum is σ = 128622208. Its totient is φ = 128171340.

The previous prime is 128396759. The next prime is 128396837. The reversal of 128396773 is 377693821.

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.

It is a cyclic number.

It is not a de Polignac number, because 128396773 - 2¹⁷ = 128265701 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 (128396273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111861 + ... + 113002.

It is an arithmetic number, because the mean of its divisors is an integer number (32155552).

Almost surely, 2^128396773 is an apocalyptic number.

It is an amenable number.

128396773 is a deficient number, since it is larger than the sum of its proper divisors (225435).

128396773 is an equidigital number, since it uses as much as digits as its factorization.

128396773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225434.

The product of its digits is 381024, while the sum is 46.

The square root of 128396773 is about 11331.2299861930. The cubic root of 128396773 is about 504.4886147616.

The spelling of 128396773 in words is "one hundred twenty-eight million, three hundred ninety-six thousand, seven hundred seventy-three".