1240543140 has 24 divisors (see below), whose sum is σ = 3473520960. Its totient is φ = 330811488.

The previous prime is 1240543103. The next prime is 1240543147. The reversal of 1240543140 is 413450421.

1240543140 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1240543140.

It is not an unprimeable number, because it can be changed into a prime (1240543147) 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, 10337800 + ... + 10337919.

It is an arithmetic number, because the mean of its divisors is an integer number (144730040).

Almost surely, 2^1240543140 is an apocalyptic number.

1240543140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240543140 is an abundant number, since it is smaller than the sum of its proper divisors (2232977820).

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

1240543140 is a wasteful number, since it uses less digits than its factorization.

1240543140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20675731 (or 20675729 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1240543140 is about 35221.3449487665. The cubic root of 1240543140 is about 1074.4939070807.

Adding to 1240543140 its reverse (413450421), we get a palindrome (1653993561).

The spelling of 1240543140 in words is "one billion, two hundred forty million, five hundred forty-three thousand, one hundred forty".