1563138 has 20 divisors (see below), whose sum is σ = 3502950. Its totient is φ = 520992.

The previous prime is 1563137. The next prime is 1563143. The reversal of 1563138 is 8313651.

It can be written as a sum of positive squares in only one way, i.e., 1520289 + 42849 = 1233^2 + 207^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1563131) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4663 + ... + 4986.

2^1563138 is an apocalyptic number.

1563138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1563138 is an abundant number, since it is smaller than the sum of its proper divisors (1939812).

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

1563138 is an equidigital number, since it uses as much as digits as its factorization.

1563138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9663 (or 9654 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1563138 is about 1250.2551739545. The cubic root of 1563138 is about 116.0555124708.

Adding to 1563138 its reverse (8313651), we get a palindrome (9876789).

The spelling of 1563138 in words is "one million, five hundred sixty-three thousand, one hundred thirty-eight".