1245311440 has 40 divisors (see below), whose sum is σ = 2913820200. Its totient is φ = 494946816.

The previous prime is 1245311437. The next prime is 1245311443. The reversal of 1245311440 is 441135421.

It is an interprime number because it is at equal distance from previous prime (1245311437) and next prime (1245311443).

It can be written as a sum of positive squares in 4 ways, for example, as 174451264 + 1070860176 = 13208^2 + 32724^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245311443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37015 + ... + 62134.

It is an arithmetic number, because the mean of its divisors is an integer number (72845505).

Almost surely, 2^1245311440 is an apocalyptic number.

1245311440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1245311440 is an abundant number, since it is smaller than the sum of its proper divisors (1668508760).

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

1245311440 is a wasteful number, since it uses less digits than its factorization.

1245311440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99319 (or 99313 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1245311440 is about 35288.9705148790. The cubic root of 1245311440 is about 1075.8688314101.

Adding to 1245311440 its reverse (441135421), we get a palindrome (1686446861).

The spelling of 1245311440 in words is "one billion, two hundred forty-five million, three hundred eleven thousand, four hundred forty".