1240242520 has 32 divisors (see below), whose sum is σ = 3044232720. Its totient is φ = 450997120.

The previous prime is 1240242433. The next prime is 1240242541. The reversal of 1240242520 is 252420421.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1240242491 and 1240242500.

It is a congruent number.

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, 1408927 + ... + 1409806.

Almost surely, 2^1240242520 is an apocalyptic number.

1240242520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240242520 is an abundant number, since it is smaller than the sum of its proper divisors (1803990200).

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

1240242520 is a wasteful number, since it uses less digits than its factorization.

1240242520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2818755 (or 2818751 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 1240242520 is about 35217.0771075625. The cubic root of 1240242520 is about 1074.4071062691.

Adding to 1240242520 its reverse (252420421), we get a palindrome (1492662941).

The spelling of 1240242520 in words is "one billion, two hundred forty million, two hundred forty-two thousand, five hundred twenty".