1281020 has 36 divisors (see below), whose sum is σ = 2920680. Its totient is φ = 471744.

The previous prime is 1280989. The next prime is 1281029. The reversal of 1281020 is 201821.

It is a junction number, because it is equal to n+sod(n) for n = 1280986 and 1281004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3191 + ... + 3569.

It is an arithmetic number, because the mean of its divisors is an integer number (81130).

2^1281020 is an apocalyptic number.

1281020 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 1281020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1460340).

1281020 is an abundant number, since it is smaller than the sum of its proper divisors (1639660).

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

1281020 is a wasteful number, since it uses less digits than its factorization.

1281020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1281020 is about 1131.8215407033. The cubic root of 1281020 is about 108.6055376936.

Adding to 1281020 its reverse (201821), we get a palindrome (1482841).

The spelling of 1281020 in words is "one million, two hundred eighty-one thousand, twenty".