1368991893 has 16 divisors (see below), whose sum is σ = 1895114880. Its totient is φ = 877993536.

The previous prime is 1368991879. The next prime is 1368991909. The reversal of 1368991893 is 3981998631.

It is not a de Polignac number, because 1368991893 - 2¹⁶ = 1368926357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1368991873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4305 + ... + 52502.

It is an arithmetic number, because the mean of its divisors is an integer number (118444680).

Almost surely, 2^1368991893 is an apocalyptic number.

It is an amenable number.

1368991893 is a deficient number, since it is larger than the sum of its proper divisors (526122987).

1368991893 is a wasteful number, since it uses less digits than its factorization.

1368991893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57116.

The product of its digits is 2519424, while the sum is 57.

The square root of 1368991893 is about 36999.8904457838. The cubic root of 1368991893 is about 1110.3680550424.

The spelling of 1368991893 in words is "one billion, three hundred sixty-eight million, nine hundred ninety-one thousand, eight hundred ninety-three".