128698459 has 4 divisors (see below), whose sum is σ = 129049504. Its totient is φ = 128347416.

The previous prime is 128698447. The next prime is 128698481. The reversal of 128698459 is 954896821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128698459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128698859) 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, 174972 + ... + 175705.

It is an arithmetic number, because the mean of its divisors is an integer number (32262376).

Almost surely, 2^128698459 is an apocalyptic number.

128698459 is a deficient number, since it is larger than the sum of its proper divisors (351045).

128698459 is an equidigital number, since it uses as much as digits as its factorization.

128698459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351044.

The product of its digits is 1244160, while the sum is 52.

The square root of 128698459 is about 11344.5343227477. The cubic root of 128698459 is about 504.8834276562.

The spelling of 128698459 in words is "one hundred twenty-eight million, six hundred ninety-eight thousand, four hundred fifty-nine".