128997803 has 4 divisors (see below), whose sum is σ = 140724888. Its totient is φ = 117270720.

The previous prime is 128997797. The next prime is 128997811. The reversal of 128997803 is 308799821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 308799821 = 11 ⋅28072711.

It is a cyclic number.

It is not a de Polignac number, because 128997803 - 2⁴ = 128997787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128997833) 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, 5863526 + ... + 5863547.

It is an arithmetic number, because the mean of its divisors is an integer number (35181222).

Almost surely, 2^128997803 is an apocalyptic number.

128997803 is a deficient number, since it is larger than the sum of its proper divisors (11727085).

128997803 is a wasteful number, since it uses less digits than its factorization.

128997803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11727084.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 128997803 is about 11357.7199736567. The cubic root of 128997803 is about 505.2745662433.

It can be divided in two parts, 12899 and 7803, that added together give a palindrome (20702).

The spelling of 128997803 in words is "one hundred twenty-eight million, nine hundred ninety-seven thousand, eight hundred three".