1563923 has 4 divisors (see below), whose sum is σ = 1572840. Its totient is φ = 1555008.

The previous prime is 1563911. The next prime is 1563937. The reversal of 1563923 is 3293651.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1563923 - 2¹⁸ = 1301779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1563943) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4190 + ... + 4547.

It is an arithmetic number, because the mean of its divisors is an integer number (393210).

2^1563923 is an apocalyptic number.

1563923 is a deficient number, since it is larger than the sum of its proper divisors (8917).

1563923 is an equidigital number, since it uses as much as digits as its factorization.

1563923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8916.

The product of its digits is 4860, while the sum is 29.

The square root of 1563923 is about 1250.5690704635. The cubic root of 1563923 is about 116.0749367167.

The spelling of 1563923 in words is "one million, five hundred sixty-three thousand, nine hundred twenty-three".