6181220 has 24 divisors (see below), whose sum is σ = 13332984. Its totient is φ = 2405376.

The previous prime is 6181187. The next prime is 6181223. The reversal of 6181220 is 221816.

It can be written as a sum of positive squares in 4 ways, for example, as 2149156 + 4032064 = 1466^2 + 2008^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 6181192 and 6181201.

It is not an unprimeable number, because it can be changed into a prime (6181223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3437 + ... + 4916.

It is an arithmetic number, because the mean of its divisors is an integer number (555541).

Almost surely, 2^6181220 is an apocalyptic number.

It is an amenable number.

6181220 is an abundant number, since it is smaller than the sum of its proper divisors (7151764).

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

6181220 is a wasteful number, since it uses less digits than its factorization.

6181220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8399 (or 8397 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 6181220 is about 2486.2059448083. The cubic root of 6181220 is about 183.5233805191.

The spelling of 6181220 in words is "six million, one hundred eighty-one thousand, two hundred twenty".