1664122 has 8 divisors (see below), whose sum is σ = 2524500. Its totient is φ = 822624.

The previous prime is 1664101. The next prime is 1664123. The reversal of 1664122 is 2214661.

It can be written as a sum of positive squares in 2 ways, for example, as 1661521 + 2601 = 1289^2 + 51^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1664093 and 1664102.

It is not an unprimeable number, because it can be changed into a prime (1664123) 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 3 ways as a sum of consecutive naturals, for example, 4497 + ... + 4852.

2^1664122 is an apocalyptic number.

1664122 is a deficient number, since it is larger than the sum of its proper divisors (860378).

1664122 is an equidigital number, since it uses as much as digits as its factorization.

1664122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9440.

The product of its digits is 576, while the sum is 22.

The square root of 1664122 is about 1290.0085271036. The cubic root of 1664122 is about 118.5027386953.

Subtracting from 1664122 its sum of digits (22), we obtain a square (1664100 = 1290²).

Adding to 1664122 its reverse (2214661), we get a palindrome (3878783).

The spelling of 1664122 in words is "one million, six hundred sixty-four thousand, one hundred twenty-two".