1243251140 has 24 divisors (see below), whose sum is σ = 2764406232. Its totient is φ = 468047360.

The previous prime is 1243251137. The next prime is 1243251143. The reversal of 1243251140 is 411523421.

It is an interprime number because it is at equal distance from previous prime (1243251137) and next prime (1243251143).

It can be written as a sum of positive squares in 4 ways, for example, as 328914496 + 914336644 = 18136^2 + 30238^2 .

It is a super-2 number, since 2×1243251140² = 3091346794222599200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1243251143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1827971 + ... + 1828650.

It is an arithmetic number, because the mean of its divisors is an integer number (115183593).

Almost surely, 2^1243251140 is an apocalyptic number.

1243251140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243251140 is an abundant number, since it is smaller than the sum of its proper divisors (1521155092).

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

1243251140 is a wasteful number, since it uses less digits than its factorization.

1243251140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656647 (or 3656645 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1243251140 is about 35259.7665902655. The cubic root of 1243251140 is about 1075.2751817605.

Adding to 1243251140 its reverse (411523421), we get a palindrome (1654774561).

The spelling of 1243251140 in words is "one billion, two hundred forty-three million, two hundred fifty-one thousand, one hundred forty".