3217816 has 32 divisors (see below), whose sum is σ = 7086240. Its totient is φ = 1340928.

The previous prime is 3217813. The next prime is 3217817. The reversal of 3217816 is 6187123.

3217816 = 675² + 676² + ... + 681².

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3217813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (221445).

Almost surely, 2^3217816 is an apocalyptic number.

3217816 is the 1036-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3217816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3543120).

3217816 is an abundant number, since it is smaller than the sum of its proper divisors (3868424).

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

3217816 is a wasteful number, since it uses less digits than its factorization.

3217816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603 (or 1599 counting only the distinct ones).

The product of its digits is 2016, while the sum is 28.

The square root of 3217816 is about 1793.8271934610. The cubic root of 3217816 is about 147.6342319184.

The spelling of 3217816 in words is "three million, two hundred seventeen thousand, eight hundred sixteen".