1161220 has 12 divisors (see below), whose sum is σ = 2438604. Its totient is φ = 464480.

The previous prime is 1161217. The next prime is 1161227. The reversal of 1161220 is 221611.

It can be written as a sum of positive squares in 2 ways, for example, as 329476 + 831744 = 574^2 + 912^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1161220.

It is not an unprimeable number, because it can be changed into a prime (1161227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29011 + ... + 29050.

It is an arithmetic number, because the mean of its divisors is an integer number (203217).

2^1161220 is an apocalyptic number.

1161220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1161220 is an abundant number, since it is smaller than the sum of its proper divisors (1277384).

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

1161220 is a wasteful number, since it uses less digits than its factorization.

1161220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58070 (or 58068 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1161220 is about 1077.5991833701. The cubic root of 1161220 is about 105.1085800450.

Adding to 1161220 its reverse (221611), we get a palindrome (1382831).

The spelling of 1161220 in words is "one million, one hundred sixty-one thousand, two hundred twenty".