1620216 has 64 divisors (see below), whose sum is σ = 4855200. Its totient is φ = 497664.

The previous prime is 1620209. The next prime is 1620217. The reversal of 1620216 is 6120261.

It is a happy number.

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

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620217) 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 15 ways as a sum of consecutive naturals, for example, 2520 + ... + 3096.

2^1620216 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 1620216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2427600).

1620216 is an abundant number, since it is smaller than the sum of its proper divisors (3234984).

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

1620216 is a wasteful number, since it uses less digits than its factorization.

1620216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1620216 is about 1272.8770561213. The cubic root of 1620216 is about 117.4512488266.

Adding to 1620216 its reverse (6120261), we get a palindrome (7740477).

The spelling of 1620216 in words is "one million, six hundred twenty thousand, two hundred sixteen".