19868943 has 4 divisors (see below), whose sum is σ = 26491928. Its totient is φ = 13245960.

The previous prime is 19868939. The next prime is 19868957. The reversal of 19868943 is 34986891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34986891 = 3 ⋅11662297.

It is not a de Polignac number, because 19868943 - 2² = 19868939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19868892 and 19868901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19068943) 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, 3311488 + ... + 3311493.

It is an arithmetic number, because the mean of its divisors is an integer number (6622982).

Almost surely, 2^19868943 is an apocalyptic number.

19868943 is a deficient number, since it is larger than the sum of its proper divisors (6622985).

19868943 is an equidigital number, since it uses as much as digits as its factorization.

19868943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622984.

The product of its digits is 373248, while the sum is 48.

The square root of 19868943 is about 4457.4592538799. The cubic root of 19868943 is about 270.8475561341.

The spelling of 19868943 in words is "nineteen million, eight hundred sixty-eight thousand, nine hundred forty-three".