1563240 has 64 divisors (see below), whose sum is σ = 5362560. Its totient is φ = 357120.

The previous prime is 1563239. The next prime is 1563253. The reversal of 1563240 is 423651.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91 + ... + 1770.

It is an arithmetic number, because the mean of its divisors is an integer number (83790).

2^1563240 is an apocalyptic number.

1563240 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 1563240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2681280).

1563240 is an abundant number, since it is smaller than the sum of its proper divisors (3799320).

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

1563240 is a wasteful number, since it uses less digits than its factorization.

1563240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1563240 is about 1250.2959649619. The cubic root of 1563240 is about 116.0580367531.

Adding to 1563240 its reverse (423651), we get a palindrome (1986891).

The spelling of 1563240 in words is "one million, five hundred sixty-three thousand, two hundred forty".