1646216 has 32 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 690240.

The previous prime is 1646209. The next prime is 1646219. The reversal of 1646216 is 6126461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (1646219) 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, 425 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (113400).

2^1646216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814400).

1646216 is an abundant number, since it is smaller than the sum of its proper divisors (1982584).

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

1646216 is a wasteful number, since it uses less digits than its factorization.

1646216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469 (or 1465 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 1646216 is about 1283.0494924203. The cubic root of 1646216 is about 118.0761741232.

The spelling of 1646216 in words is "one million, six hundred forty-six thousand, two hundred sixteen".