1284204856 has 32 divisors (see below), whose sum is σ = 2671315200. Its totient is φ = 573833440.

The previous prime is 1284204841. The next prime is 1284204899. The reversal of 1284204856 is 6584024821.

It is a happy number.

It is a super-2 number, since 2×1284204856² = 3298364224347961472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118480 + ... + 128863.

It is an arithmetic number, because the mean of its divisors is an integer number (83478600).

Almost surely, 2^1284204856 is an apocalyptic number.

It is an amenable number.

1284204856 is an abundant number, since it is smaller than the sum of its proper divisors (1387110344).

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

1284204856 is a wasteful number, since it uses less digits than its factorization.

1284204856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247419 (or 247415 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The square root of 1284204856 is about 35835.8041070659. The cubic root of 1284204856 is about 1086.9546778624.

The spelling of 1284204856 in words is "one billion, two hundred eighty-four million, two hundred four thousand, eight hundred fifty-six".