1281320 has 32 divisors (see below), whose sum is σ = 2920320. Its totient is φ = 505920.

The previous prime is 1281317. The next prime is 1281331. The reversal of 1281320 is 231821.

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, 3965 + ... + 4275.

It is an arithmetic number, because the mean of its divisors is an integer number (91260).

2^1281320 is an apocalyptic number.

1281320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281320 is an abundant number, since it is smaller than the sum of its proper divisors (1639000).

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

1281320 is a wasteful number, since it uses less digits than its factorization.

1281320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1281320 is about 1131.9540626722. The cubic root of 1281320 is about 108.6140150835.

The spelling of 1281320 in words is "one million, two hundred eighty-one thousand, three hundred twenty".