1331220 has 48 divisors (see below), whose sum is σ = 4068288. Its totient is φ = 322560.

The previous prime is 1331207. The next prime is 1331227. The reversal of 1331220 is 221331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1331196 and 1331205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (84756).

2^1331220 is an apocalyptic number.

1331220 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 1331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2034144).

1331220 is an abundant number, since it is smaller than the sum of its proper divisors (2737068).

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

1331220 is a wasteful number, since it uses less digits than its factorization.

1331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040 (or 2038 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1331220 is about 1153.7850753065. The cubic root of 1331220 is about 110.0060602722.

Adding to 1331220 its reverse (221331), we get a palindrome (1552551).

It can be divided in two parts, 1331 and 220, that added together give a palindrome (1551).

The spelling of 1331220 in words is "one million, three hundred thirty-one thousand, two hundred twenty".