1563642 has 12 divisors (see below), whose sum is σ = 3387930. Its totient is φ = 521208.

The previous prime is 1563631. The next prime is 1563649. The reversal of 1563642 is 2463651.

1563642 is a `hidden beast` number, since 15 + 6 + 3 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1418481 + 145161 = 1191^2 + 381^2 .

It is not an unprimeable number, because it can be changed into a prime (1563649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43417 + ... + 43452.

2^1563642 is an apocalyptic number.

1563642 is an abundant number, since it is smaller than the sum of its proper divisors (1824288).

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

1563642 is a wasteful number, since it uses less digits than its factorization.

1563642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86877 (or 86874 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1563642 is about 1250.4567165640. The cubic root of 1563642 is about 116.0679843261.

Subtracting 1563642 from its reverse (2463651), we obtain a palindrome (900009).

The spelling of 1563642 in words is "one million, five hundred sixty-three thousand, six hundred forty-two".