1263240 has 144 divisors (see below), whose sum is σ = 4668300. Its totient is φ = 295680.

The previous prime is 1263239. The next prime is 1263247. The reversal of 1263240 is 423621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1258884 + 4356 = 1122^2 + 66^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (1263247) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43546 + ... + 43574.

2^1263240 is an apocalyptic number.

1263240 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 1263240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2334150).

1263240 is an abundant number, since it is smaller than the sum of its proper divisors (3405060).

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

1263240 is a wasteful number, since it uses less digits than its factorization.

1263240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1263240 is about 1123.9395001511. The cubic root of 1263240 is about 108.1007290684.

Adding to 1263240 its reverse (423621), we get a palindrome (1686861).

The spelling of 1263240 in words is "one million, two hundred sixty-three thousand, two hundred forty".