3161220 has 96 divisors (see below), whose sum is σ = 9676800. Its totient is φ = 768384.

The previous prime is 3161209. The next prime is 3161227. The reversal of 3161220 is 221613.

3161220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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 3161220.

It is not an unprimeable number, because it can be changed into a prime (3161227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53551 + ... + 53609.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

Almost surely, 2^3161220 is an apocalyptic number.

3161220 is a gapful number since it is divisible by the number (30) 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 3161220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4838400).

3161220 is an abundant number, since it is smaller than the sum of its proper divisors (6515580).

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

3161220 is a wasteful number, since it uses less digits than its factorization.

3161220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 135 counting only the distinct ones).

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

The square root of 3161220 is about 1777.9820021586. The cubic root of 3161220 is about 146.7635608587.

Adding to 3161220 its reverse (221613), we get a palindrome (3382833).

The spelling of 3161220 in words is "three million, one hundred sixty-one thousand, two hundred twenty".