1968908309 has 4 divisors (see below), whose sum is σ = 1978239840. Its totient is φ = 1959576780.

The previous prime is 1968908303. The next prime is 1968908317. The reversal of 1968908309 is 9038098691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9038098691 = 75347 ⋅119953.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1968908309 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 (1968908303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4665449 + ... + 4665870.

It is an arithmetic number, because the mean of its divisors is an integer number (494559960).

Almost surely, 2^1968908309 is an apocalyptic number.

It is an amenable number.

1968908309 is a deficient number, since it is larger than the sum of its proper divisors (9331531).

1968908309 is an equidigital number, since it uses as much as digits as its factorization.

1968908309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9331530.

The product of its (nonzero) digits is 839808, while the sum is 53.

The square root of 1968908309 is about 44372.3822777186. The cubic root of 1968908309 is about 1253.3580764993.

The spelling of 1968908309 in words is "one billion, nine hundred sixty-eight million, nine hundred eight thousand, three hundred nine".