1240204135 has 12 divisors (see below), whose sum is σ = 1537807464. Its totient is φ = 960154320.

The previous prime is 1240204123. The next prime is 1240204139. The reversal of 1240204135 is 5314020421.

It is not a de Polignac number, because 1240204135 - 2¹⁷ = 1240073063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240204139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124249 + ... + 133858.

It is an arithmetic number, because the mean of its divisors is an integer number (128150622).

Almost surely, 2^1240204135 is an apocalyptic number.

1240204135 is a deficient number, since it is larger than the sum of its proper divisors (297603329).

1240204135 is an equidigital number, since it uses as much as digits as its factorization.

1240204135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258174 (or 258143 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1240204135 is about 35216.5321262614. The cubic root of 1240204135 is about 1074.3960220009.

Adding to 1240204135 its reverse (5314020421), we get a palindrome (6554224556).

The spelling of 1240204135 in words is "one billion, two hundred forty million, two hundred four thousand, one hundred thirty-five".