128903789 has 4 divisors (see below), whose sum is σ = 147318624. Its totient is φ = 110488956.

The previous prime is 128903777. The next prime is 128903839. The reversal of 128903789 is 987309821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 987309821 = 3209 ⋅307669.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128903789 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 (128903759) 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, 9207407 + ... + 9207420.

It is an arithmetic number, because the mean of its divisors is an integer number (36829656).

Almost surely, 2^128903789 is an apocalyptic number.

It is an amenable number.

128903789 is a deficient number, since it is larger than the sum of its proper divisors (18414835).

128903789 is an equidigital number, since it uses as much as digits as its factorization.

128903789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18414834.

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

The square root of 128903789 is about 11353.5804484753. The cubic root of 128903789 is about 505.1517878529.

The spelling of 128903789 in words is "one hundred twenty-eight million, nine hundred three thousand, seven hundred eighty-nine".