128924789 has 16 divisors (see below), whose sum is σ = 150405888. Its totient is φ = 108231552.

The previous prime is 128924773. The next prime is 128924801. The reversal of 128924789 is 987429821.

It is not a de Polignac number, because 128924789 - 2⁴ = 128924773 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 (128923789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79424 + ... + 81030.

It is an arithmetic number, because the mean of its divisors is an integer number (9400368).

Almost surely, 2^128924789 is an apocalyptic number.

It is an amenable number.

128924789 is a deficient number, since it is larger than the sum of its proper divisors (21481099).

128924789 is a wasteful number, since it uses less digits than its factorization.

128924789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844.

The product of its digits is 580608, while the sum is 50.

The square root of 128924789 is about 11354.5052292031. The cubic root of 128924789 is about 505.1792181600.

The spelling of 128924789 in words is "one hundred twenty-eight million, nine hundred twenty-four thousand, seven hundred eighty-nine".