1081280 has 56 divisors (see below), whose sum is σ = 2682240. Its totient is φ = 414720.

The previous prime is 1081279. The next prime is 1081291. The reversal of 1081280 is 821801.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 9866 + ... + 9974.

2^1081280 is an apocalyptic number.

1081280 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 1081280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341120).

1081280 is an abundant number, since it is smaller than the sum of its proper divisors (1600960).

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

1081280 is a wasteful number, since it uses less digits than its factorization.

1081280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1081280 is about 1039.8461424653. The cubic root of 1081280 is about 102.6390735614.

The spelling of 1081280 in words is "one million, eighty-one thousand, two hundred eighty".