1616220 has 96 divisors (see below), whose sum is σ = 5221440. Its totient is φ = 414720.

The previous prime is 1616201. The next prime is 1616221. The reversal of 1616220 is 226161.

It is a happy number.

It is a super-2 number, since 2×1616220² = 5224334176800, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1616193 and 1616202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616221) 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, 22104 + ... + 22176.

It is an arithmetic number, because the mean of its divisors is an integer number (54390).

2^1616220 is an apocalyptic number.

1616220 is a gapful number since it is divisible by the number (10) 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 1616220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2610720).

1616220 is an abundant number, since it is smaller than the sum of its proper divisors (3605220).

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

1616220 is a wasteful number, since it uses less digits than its factorization.

1616220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 124 counting only the distinct ones).

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

The square root of 1616220 is about 1271.3064146774. The cubic root of 1616220 is about 117.3546111836.

The spelling of 1616220 in words is "one million, six hundred sixteen thousand, two hundred twenty".