1216340258 has 8 divisors (see below), whose sum is σ = 2085154752. Its totient is φ = 521288676.

The previous prime is 1216340231. The next prime is 1216340291. The reversal of 1216340258 is 8520436121.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 43440710 + ... + 43440737.

It is an arithmetic number, because the mean of its divisors is an integer number (260644344).

Almost surely, 2^1216340258 is an apocalyptic number.

1216340258 is a deficient number, since it is larger than the sum of its proper divisors (868814494).

1216340258 is an equidigital number, since it uses as much as digits as its factorization.

1216340258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86881456.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1216340258 is about 34876.0699907544. The cubic root of 1216340258 is about 1067.4602055781.

Adding to 1216340258 its reverse (8520436121), we get a palindrome (9736776379).

The spelling of 1216340258 in words is "one billion, two hundred sixteen million, three hundred forty thousand, two hundred fifty-eight".