1240242215 has 4 divisors (see below), whose sum is σ = 1488290664. Its totient is φ = 992193768.

The previous prime is 1240242209. The next prime is 1240242229. The reversal of 1240242215 is 5122420421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240242215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124024217 + ... + 124024226.

It is an arithmetic number, because the mean of its divisors is an integer number (372072666).

Almost surely, 2^1240242215 is an apocalyptic number.

1240242215 is a deficient number, since it is larger than the sum of its proper divisors (248048449).

1240242215 is an equidigital number, since it uses as much as digits as its factorization.

1240242215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248048448.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1240242215 is about 35217.0727772766. The cubic root of 1240242215 is about 1074.4070181965.

Adding to 1240242215 its reverse (5122420421), we get a palindrome (6362662636).

The spelling of 1240242215 in words is "one billion, two hundred forty million, two hundred forty-two thousand, two hundred fifteen".