3123216 has 90 divisors (see below), whose sum is σ = 9360078. Its totient is φ = 971520.

The previous prime is 3123209. The next prime is 3123217. The reversal of 3123216 is 6123213.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 1218816 = 1380^2 + 1104^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3123217) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 76156 + ... + 76196.

Almost surely, 2^3123216 is an apocalyptic number.

3123216 is a gapful number since it is divisible by the number (36) 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 3123216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4680039).

3123216 is an abundant number, since it is smaller than the sum of its proper divisors (6236862).

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

3123216 is a wasteful number, since it uses less digits than its factorization.

3123216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 69 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 3123216 is about 1767.2622895315. The cubic root of 3123216 is about 146.1730605607.

Adding to 3123216 its reverse (6123213), we get a palindrome (9246429).

The spelling of 3123216 in words is "three million, one hundred twenty-three thousand, two hundred sixteen".