1263005240 has 128 divisors (see below), whose sum is σ = 3438720000. Its totient is φ = 407835648.

The previous prime is 1263005203. The next prime is 1263005243. The reversal of 1263005240 is 425003621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263005243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1058084 + ... + 1059276.

It is an arithmetic number, because the mean of its divisors is an integer number (26865000).

Almost surely, 2^1263005240 is an apocalyptic number.

1263005240 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 1263005240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1719360000).

1263005240 is an abundant number, since it is smaller than the sum of its proper divisors (2175714760).

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

1263005240 is a wasteful number, since it uses less digits than its factorization.

1263005240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429 (or 1425 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1263005240 is about 35538.7850101829. The cubic root of 1263005240 is about 1080.9403218860.

Adding to 1263005240 its reverse (425003621), we get a palindrome (1688008861).

The spelling of 1263005240 in words is "one billion, two hundred sixty-three million, five thousand, two hundred forty".