1280540 has 24 divisors (see below), whose sum is σ = 2753520. Its totient is φ = 499968.

The previous prime is 1280537. The next prime is 1280549. The reversal of 1280540 is 450821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116 + ... + 1604.

It is an arithmetic number, because the mean of its divisors is an integer number (114730).

2^1280540 is an apocalyptic number.

1280540 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 1280540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1376760).

1280540 is an abundant number, since it is smaller than the sum of its proper divisors (1472980).

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

1280540 is a wasteful number, since it uses less digits than its factorization.

1280540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541 (or 1539 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1280540 is about 1131.6094732725. The cubic root of 1280540 is about 108.5919711162.

The spelling of 1280540 in words is "one million, two hundred eighty thousand, five hundred forty".