1563904 has 36 divisors (see below), whose sum is σ = 3219300. Its totient is φ = 757760.

The previous prime is 1563901. The next prime is 1563911. The reversal of 1563904 is 4093651.

It can be written as a sum of positive squares in 2 ways, for example, as 123904 + 1440000 = 352^2 + 1200^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1563901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10422 + ... + 10570.

It is an arithmetic number, because the mean of its divisors is an integer number (89425).

2^1563904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1563904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609650).

1563904 is an abundant number, since it is smaller than the sum of its proper divisors (1655396).

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

1563904 is an equidigital number, since it uses as much as digits as its factorization.

1563904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1563904 is about 1250.5614738988. The cubic root of 1563904 is about 116.0744666525.

The spelling of 1563904 in words is "one million, five hundred sixty-three thousand, nine hundred four".