1243152540 has 216 divisors, whose sum is σ = 4645145232. Its totient is φ = 267402240.

The previous prime is 1243152511. The next prime is 1243152563. The reversal of 1243152540 is 452513421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 145795 + ... + 154085.

It is an arithmetic number, because the mean of its divisors is an integer number (21505302).

Almost surely, 2^1243152540 is an apocalyptic number.

1243152540 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 1243152540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2322572616).

1243152540 is an abundant number, since it is smaller than the sum of its proper divisors (3401992692).

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

1243152540 is a wasteful number, since it uses less digits than its factorization.

1243152540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8337 (or 8325 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1243152540 is about 35258.3683683746. The cubic root of 1243152540 is about 1075.2467549655.

Adding to 1243152540 its reverse (452513421), we get a palindrome (1695665961).

The spelling of 1243152540 in words is "one billion, two hundred forty-three million, one hundred fifty-two thousand, five hundred forty".