1662220 has 48 divisors (see below), whose sum is σ = 4128768. Its totient is φ = 550080.

The previous prime is 1662217. The next prime is 1662223. The reversal of 1662220 is 222661.

It is an interprime number because it is at equal distance from previous prime (1662217) and next prime (1662223).

It is not an unprimeable number, because it can be changed into a prime (1662223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4149 + ... + 4531.

It is an arithmetic number, because the mean of its divisors is an integer number (86016).

2^1662220 is an apocalyptic number.

1662220 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 1662220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2064384).

1662220 is an abundant number, since it is smaller than the sum of its proper divisors (2466548).

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

1662220 is a wasteful number, since it uses less digits than its factorization.

1662220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1662220 is about 1289.2711119078. The cubic root of 1662220 is about 118.4575741113.

Adding to 1662220 its reverse (222661), we get a palindrome (1884881).

The spelling of 1662220 in words is "one million, six hundred sixty-two thousand, two hundred twenty".