1240452313 has 4 divisors (see below), whose sum is σ = 1241116468. Its totient is φ = 1239788160.

The previous prime is 1240452299. The next prime is 1240452319. The reversal of 1240452313 is 3132540421.

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 286692624 + 953759689 = 16932^2 + 30883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240452313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240452319) 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 3 ways as a sum of consecutive naturals, for example, 329268 + ... + 333013.

It is an arithmetic number, because the mean of its divisors is an integer number (310279117).

Almost surely, 2^1240452313 is an apocalyptic number.

It is an amenable number.

1240452313 is a deficient number, since it is larger than the sum of its proper divisors (664155).

1240452313 is an equidigital number, since it uses as much as digits as its factorization.

1240452313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664154.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1240452313 is about 35220.0555507796. The cubic root of 1240452313 is about 1074.4676832338.

Adding to 1240452313 its reverse (3132540421), we get a palindrome (4372992734).

The spelling of 1240452313 in words is "one billion, two hundred forty million, four hundred fifty-two thousand, three hundred thirteen".