1281120 has 96 divisors (see below), whose sum is σ = 4300128. Its totient is φ = 319488.

The previous prime is 1281101. The next prime is 1281131. The reversal of 1281120 is 211821.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1281120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8082 + ... + 8238.

It is an arithmetic number, because the mean of its divisors is an integer number (44793).

2^1281120 is an apocalyptic number.

1281120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2150064).

1281120 is an abundant number, since it is smaller than the sum of its proper divisors (3019008).

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

1281120 is a wasteful number, since it uses less digits than its factorization.

1281120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1281120 is about 1131.8657164169. The cubic root of 1281120 is about 108.6083636373.

Adding to 1281120 its reverse (211821), we get a palindrome (1492941).

The spelling of 1281120 in words is "one million, two hundred eighty-one thousand, one hundred twenty".