1023660 has 108 divisors (see below), whose sum is σ = 3485664. Its totient is φ = 242880.

The previous prime is 1023653. The next prime is 1023697. The reversal of 1023660 is 663201.

It is a happy number.

1023660 is a `hidden beast` number, since 1 + 0 + 2 + 3 + 660 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 35 ways as a sum of consecutive naturals, for example, 21757 + ... + 21803.

2^1023660 is an apocalyptic number.

1023660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1023660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1742832).

1023660 is an abundant number, since it is smaller than the sum of its proper divisors (2462004).

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

1023660 is a wasteful number, since it uses less digits than its factorization.

1023660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1023660 is about 1011.7608413059. The cubic root of 1023660 is about 100.7825272057.

Adding to 1023660 its reverse (663201), we get a palindrome (1686861).

It can be divided in two parts, 10236 and 60, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 1023660 in words is "one million, twenty-three thousand, six hundred sixty".