1280020984 has 96 divisors (see below), whose sum is σ = 2847085200. Its totient is φ = 533196800.

The previous prime is 1280020979. The next prime is 1280021009. The reversal of 1280020984 is 4890200821.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2514522 + ... + 2515030.

Almost surely, 2^1280020984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280020984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1423542600).

1280020984 is an abundant number, since it is smaller than the sum of its proper divisors (1567064216).

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

1280020984 is a wasteful number, since it uses less digits than its factorization.

1280020984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 580 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1280020984 is about 35777.3808991100. The cubic root of 1280020984 is about 1085.7729798700.

The spelling of 1280020984 in words is "one billion, two hundred eighty million, twenty thousand, nine hundred eighty-four".