1661022 has 24 divisors (see below), whose sum is σ = 3926520. Its totient is φ = 503280.

The previous prime is 1661021. The next prime is 1661029. The reversal of 1661022 is 2201661.

It is a happy number.

1661022 is a `hidden beast` number, since 1 + 661 + 0 + 2 + 2 = 666.

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 = 1660986 and 1661004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661021) 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 11 ways as a sum of consecutive naturals, for example, 3997 + ... + 4392.

It is an arithmetic number, because the mean of its divisors is an integer number (163605).

2^1661022 is an apocalyptic number.

1661022 is an abundant number, since it is smaller than the sum of its proper divisors (2265498).

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

1661022 is a wasteful number, since it uses less digits than its factorization.

1661022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8408 (or 8405 counting only the distinct ones).

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

The square root of 1661022 is about 1288.8064245650. The cubic root of 1661022 is about 118.4291089100.

Adding to 1661022 its reverse (2201661), we get a palindrome (3862683).

The spelling of 1661022 in words is "one million, six hundred sixty-one thousand, twenty-two".