1563660 has 144 divisors (see below), whose sum is σ = 5818176. Its totient is φ = 331776.

The previous prime is 1563649. The next prime is 1563689. The reversal of 1563660 is 663651.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 21384 + ... + 21456.

It is an arithmetic number, because the mean of its divisors is an integer number (40404).

2^1563660 is an apocalyptic number.

1563660 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 1563660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2909088).

1563660 is an abundant number, since it is smaller than the sum of its proper divisors (4254516).

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

1563660 is a wasteful number, since it uses less digits than its factorization.

1563660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 1563660 is about 1250.4639139136. The cubic root of 1563660 is about 116.0684296999.

Subtracting from 1563660 its reverse (663651), we obtain a palindrome (900009).

The spelling of 1563660 in words is "one million, five hundred sixty-three thousand, six hundred sixty".