1243134440 has 32 divisors (see below), whose sum is σ = 2805144480. Its totient is φ = 495815232.

The previous prime is 1243134439. The next prime is 1243134457. The reversal of 1243134440 is 444313421.

It is a super-2 number, since 2×1243134440² = 3090766471828227200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30902 + ... + 58661.

It is an arithmetic number, because the mean of its divisors is an integer number (87660765).

Almost surely, 2^1243134440 is an apocalyptic number.

1243134440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243134440 is an abundant number, since it is smaller than the sum of its proper divisors (1562010040).

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

1243134440 is a wasteful number, since it uses less digits than its factorization.

1243134440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89921 (or 89917 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 1243134440 is about 35258.1116907868. Note that the first 3 decimals coincide. The cubic root of 1243134440 is about 1075.2415364961.

Adding to 1243134440 its reverse (444313421), we get a palindrome (1687447861).

The spelling of 1243134440 in words is "one billion, two hundred forty-three million, one hundred thirty-four thousand, four hundred forty".