1280396224 has 56 divisors (see below), whose sum is σ = 2635227648. Its totient is φ = 616600320.

The previous prime is 1280396189. The next prime is 1280396237. The reversal of 1280396224 is 4226930821.

It is a happy number.

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, 448947 + ... + 451789.

Almost surely, 2^1280396224 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 1280396224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317613824).

1280396224 is an abundant number, since it is smaller than the sum of its proper divisors (1354831424).

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

1280396224 is a wasteful number, since it uses less digits than its factorization.

1280396224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113 (or 3103 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 1280396224 is about 35782.6246102770. The cubic root of 1280396224 is about 1085.8790681431.

The spelling of 1280396224 in words is "one billion, two hundred eighty million, three hundred ninety-six thousand, two hundred twenty-four".