1288331898 has 64 divisors (see below), whose sum is σ = 3104855040. Its totient is φ = 348147072.

The previous prime is 1288331857. The next prime is 1288331909. The reversal of 1288331898 is 8981338821.

It is a self number, because there is not a number n which added to its sum of digits gives 1288331898.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 746865 + ... + 748587.

It is an arithmetic number, because the mean of its divisors is an integer number (48513360).

Almost surely, 2^1288331898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1288331898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1552427520).

1288331898 is an abundant number, since it is smaller than the sum of its proper divisors (1816523142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1288331898 is a wasteful number, since it uses less digits than its factorization.

1288331898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691.

The product of its digits is 663552, while the sum is 51.

The square root of 1288331898 is about 35893.3405801132. The cubic root of 1288331898 is about 1088.1178128307.

The spelling of 1288331898 in words is "one billion, two hundred eighty-eight million, three hundred thirty-one thousand, eight hundred ninety-eight".