128984977 has 8 divisors (see below), whose sum is σ = 148116960. Its totient is φ = 111087360.

The previous prime is 128984963. The next prime is 128984981. The reversal of 128984977 is 779489821.

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-128984977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128984917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308368 + ... + 308785.

It is an arithmetic number, because the mean of its divisors is an integer number (18514620).

Almost surely, 2^128984977 is an apocalyptic number.

It is an amenable number.

128984977 is a deficient number, since it is larger than the sum of its proper divisors (19131983).

128984977 is a wasteful number, since it uses less digits than its factorization.

128984977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617183.

The product of its digits is 2032128, while the sum is 55.

The square root of 128984977 is about 11357.1553216463. The cubic root of 128984977 is about 505.2578195333.

The spelling of 128984977 in words is "one hundred twenty-eight million, nine hundred eighty-four thousand, nine hundred seventy-seven".