1240135215 has 16 divisors (see below), whose sum is σ = 2164599936. Its totient is φ = 601277600.

The previous prime is 1240135213. The next prime is 1240135223. The reversal of 1240135215 is 5125310421.

It is a happy number.

It is not a de Polignac number, because 1240135215 - 2¹ = 1240135213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240135213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3757821 + ... + 3758150.

It is an arithmetic number, because the mean of its divisors is an integer number (135287496).

Almost surely, 2^1240135215 is an apocalyptic number.

1240135215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1240135215 is a deficient number, since it is larger than the sum of its proper divisors (924464721).

1240135215 is a wasteful number, since it uses less digits than its factorization.

1240135215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7515990.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1240135215 is about 35215.5535949671. The cubic root of 1240135215 is about 1074.3761197006.

Adding to 1240135215 its reverse (5125310421), we get a palindrome (6365445636).

The spelling of 1240135215 in words is "one billion, two hundred forty million, one hundred thirty-five thousand, two hundred fifteen".