128699339 has 4 divisors (see below), whose sum is σ = 128900760. Its totient is φ = 128497920.

The previous prime is 128699327. The next prime is 128699341. The reversal of 128699339 is 933996821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 933996821 = 73 ⋅12794477.

It is a cyclic number.

It is not a de Polignac number, because 128699339 - 2¹⁶ = 128633803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128699359) 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, 99749 + ... + 101030.

It is an arithmetic number, because the mean of its divisors is an integer number (32225190).

Almost surely, 2^128699339 is an apocalyptic number.

128699339 is a deficient number, since it is larger than the sum of its proper divisors (201421).

128699339 is an equidigital number, since it uses as much as digits as its factorization.

128699339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201420.

The product of its digits is 629856, while the sum is 50.

The square root of 128699339 is about 11344.5731078785. The cubic root of 128699339 is about 504.8845783988.

The spelling of 128699339 in words is "one hundred twenty-eight million, six hundred ninety-nine thousand, three hundred thirty-nine".