128903489 has 8 divisors (see below), whose sum is σ = 151439232. Its totient is φ = 108170640.

The previous prime is 128903483. The next prime is 128903491. The reversal of 128903489 is 984309821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128903489 is a prime.

It is a super-2 number, since 2×128903489² = 33232218952746242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128903483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450569 + ... + 450854.

It is an arithmetic number, because the mean of its divisors is an integer number (18929904).

Almost surely, 2^128903489 is an apocalyptic number.

It is an amenable number.

128903489 is a deficient number, since it is larger than the sum of its proper divisors (22535743).

128903489 is a wasteful number, since it uses less digits than its factorization.

128903489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901447.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 128903489 is about 11353.5672367763. The cubic root of 128903489 is about 505.1513959698.

The spelling of 128903489 in words is "one hundred twenty-eight million, nine hundred three thousand, four hundred eighty-nine".