1661326 has 8 divisors (see below), whose sum is σ = 2514384. Its totient is φ = 823200.

The previous prime is 1661311. The next prime is 1661327. The reversal of 1661326 is 6231661.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1661326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661327) 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, 3450 + ... + 3901.

It is an arithmetic number, because the mean of its divisors is an integer number (314298).

2^1661326 is an apocalyptic number.

1661326 is a deficient number, since it is larger than the sum of its proper divisors (853058).

1661326 is a wasteful number, since it uses less digits than its factorization.

1661326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7466.

The product of its digits is 1296, while the sum is 25.

The square root of 1661326 is about 1288.9243577495. The cubic root of 1661326 is about 118.4363334286.

Adding to 1661326 its reverse (6231661), we get a palindrome (7892987).

It can be divided in two parts, 166 and 1326, that multiplied together give a triangular number (220116 = T₆₆₃).

The spelling of 1661326 in words is "one million, six hundred sixty-one thousand, three hundred twenty-six".