19678093 has 6 divisors (see below), whose sum is σ = 20020814. Its totient is φ = 19341144.

The previous prime is 19678081. The next prime is 19678103. The reversal of 19678093 is 39087691.

It can be written as a sum of positive squares in only one way, i.e., 18550249 + 1127844 = 4307^2 + 1062^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19678093 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 (19678013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 655 + ... + 6307.

Almost surely, 2^19678093 is an apocalyptic number.

It is an amenable number.

19678093 is a deficient number, since it is larger than the sum of its proper divisors (342721).

19678093 is an frugal number, since it uses more digits than its factorization.

19678093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771 (or 5712 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 19678093 is about 4435.9996618575. Note that the first 3 decimals coincide. The cubic root of 19678093 is about 269.9775610067.

The spelling of 19678093 in words is "nineteen million, six hundred seventy-eight thousand, ninety-three".