1285320384 has 168 divisors, whose sum is σ = 3812938272. Its totient is φ = 413736960.

The previous prime is 1285320373. The next prime is 1285320403. The reversal of 1285320384 is 4830235821.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 2167192 + ... + 2167784.

Almost surely, 2^1285320384 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 1285320384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906469136).

1285320384 is an abundant number, since it is smaller than the sum of its proper divisors (2527617888).

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

1285320384 is a wasteful number, since it uses less digits than its factorization.

1285320384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 1285320384 is about 35851.3651622919. The cubic root of 1285320384 is about 1087.2693154773.

The spelling of 1285320384 in words is "one billion, two hundred eighty-five million, three hundred twenty thousand, three hundred eighty-four".