1968549993 has 16 divisors (see below), whose sum is σ = 2917452160. Its totient is φ = 1311879888.

The previous prime is 1968549983. The next prime is 1968549997. The reversal of 1968549993 is 3999458691.

It is not a de Polignac number, because 1968549993 - 2⁴ = 1968549977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1968549993.

It is not an unprimeable number, because it can be changed into a prime (1968549997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69996 + ... + 94002.

It is an arithmetic number, because the mean of its divisors is an integer number (182340760).

Almost surely, 2^1968549993 is an apocalyptic number.

It is an amenable number.

1968549993 is a deficient number, since it is larger than the sum of its proper divisors (948902167).

1968549993 is a wasteful number, since it uses less digits than its factorization.

1968549993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27053 (or 27047 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The square root of 1968549993 is about 44368.3444924419. The cubic root of 1968549993 is about 1253.2820402010.

The spelling of 1968549993 in words is "one billion, nine hundred sixty-eight million, five hundred forty-nine thousand, nine hundred ninety-three".