1361220 has 72 divisors (see below), whose sum is σ = 4443264. Its totient is φ = 310464.

The previous prime is 1361197. The next prime is 1361273. The reversal of 1361220 is 221631.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1361220.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2709 + ... + 3171.

It is an arithmetic number, because the mean of its divisors is an integer number (61712).

2^1361220 is an apocalyptic number.

1361220 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 1361220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2221632).

1361220 is an abundant number, since it is smaller than the sum of its proper divisors (3082044).

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

1361220 is a wasteful number, since it uses less digits than its factorization.

1361220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1361220 is about 1166.7133324000. The cubic root of 1361220 is about 110.8262845625.

Adding to 1361220 its reverse (221631), we get a palindrome (1582851).

The spelling of 1361220 in words is "one million, three hundred sixty-one thousand, two hundred twenty".