1023666 has 16 divisors (see below), whose sum is σ = 2339904. Its totient is φ = 292464.

The previous prime is 1023653. The next prime is 1023697. The reversal of 1023666 is 6663201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12145 + ... + 12228.

It is an arithmetic number, because the mean of its divisors is an integer number (146244).

2^1023666 is an apocalyptic number.

1023666 is an abundant number, since it is smaller than the sum of its proper divisors (1316238).

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

1023666 is a wasteful number, since it uses less digits than its factorization.

1023666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24385.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 1023666 is about 1011.7638064291. The cubic root of 1023666 is about 100.7827241116.

Adding to 1023666 its reverse (6663201), we get a palindrome (7686867).

It can be divided in two parts, 10236 and 66, that multiplied together give a palindrome (675576).

The spelling of 1023666 in words is "one million, twenty-three thousand, six hundred sixty-six".