1240134205 has 4 divisors (see below), whose sum is σ = 1488161052. Its totient is φ = 992107360.

The previous prime is 1240134191. The next prime is 1240134229. The reversal of 1240134205 is 5024310421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 802362276 + 437771929 = 28326^2 + 20923^2 .

It is not a de Polignac number, because 1240134205 - 2²³ = 1231745597 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, 124013416 + ... + 124013425.

It is an arithmetic number, because the mean of its divisors is an integer number (372040263).

Almost surely, 2^1240134205 is an apocalyptic number.

It is an amenable number.

1240134205 is a deficient number, since it is larger than the sum of its proper divisors (248026847).

1240134205 is an equidigital number, since it uses as much as digits as its factorization.

1240134205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248026846.

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

The square root of 1240134205 is about 35215.5392547097. The cubic root of 1240134205 is about 1074.3758280334.

Adding to 1240134205 its reverse (5024310421), we get a palindrome (6264444626).

The spelling of 1240134205 in words is "one billion, two hundred forty million, one hundred thirty-four thousand, two hundred five".