1281880 has 32 divisors (see below), whose sum is σ = 2930400. Its totient is φ = 504576.

The previous prime is 1281871. The next prime is 1281883. The reversal of 1281880 is 881821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2701 + ... + 3139.

It is an arithmetic number, because the mean of its divisors is an integer number (91575).

2^1281880 is an apocalyptic number.

1281880 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 1281880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1465200).

1281880 is an abundant number, since it is smaller than the sum of its proper divisors (1648520).

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

1281880 is a wasteful number, since it uses less digits than its factorization.

1281880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 1281880 is about 1132.2013955123. The cubic root of 1281880 is about 108.6298360051.

The spelling of 1281880 in words is "one million, two hundred eighty-one thousand, eight hundred eighty".