128386399 has 4 divisors (see below), whose sum is σ = 129323664. Its totient is φ = 127449136.

The previous prime is 128386373. The next prime is 128386403. The reversal of 128386399 is 993683821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993683821 = 13 ⋅76437217.

It is a cyclic number.

It is not a de Polignac number, because 128386399 - 2⁵ = 128386367 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 (128386369) 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, 468427 + ... + 468700.

It is an arithmetic number, because the mean of its divisors is an integer number (32330916).

Almost surely, 2^128386399 is an apocalyptic number.

128386399 is a deficient number, since it is larger than the sum of its proper divisors (937265).

128386399 is an equidigital number, since it uses as much as digits as its factorization.

128386399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937264.

The product of its digits is 559872, while the sum is 49.

The square root of 128386399 is about 11330.7722155200. The cubic root of 128386399 is about 504.4750274371.

The spelling of 128386399 in words is "one hundred twenty-eight million, three hundred eighty-six thousand, three hundred ninety-nine".