1661322 has 48 divisors (see below), whose sum is σ = 3840480. Its totient is φ = 476064.

The previous prime is 1661311. The next prime is 1661327. The reversal of 1661322 is 2231661.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1661327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28129 + ... + 28187.

It is an arithmetic number, because the mean of its divisors is an integer number (80010).

2^1661322 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661322, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1920240).

1661322 is an abundant number, since it is smaller than the sum of its proper divisors (2179158).

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

1661322 is a wasteful number, since it uses less digits than its factorization.

1661322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 96 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 1661322 is about 1288.9228060671. The cubic root of 1661322 is about 118.4362383749.

Adding to 1661322 its reverse (2231661), we get a palindrome (3892983).

The spelling of 1661322 in words is "one million, six hundred sixty-one thousand, three hundred twenty-two".