19689943 has 8 divisors (see below), whose sum is σ = 24233888. Its totient is φ = 15578784.

The previous prime is 19689937. The next prime is 19689959. The reversal of 19689943 is 34998691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-19689943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19689913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108096 + ... + 108277.

It is an arithmetic number, because the mean of its divisors is an integer number (3029236).

Almost surely, 2^19689943 is an apocalyptic number.

19689943 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19689943 is a deficient number, since it is larger than the sum of its proper divisors (4543945).

19689943 is a wasteful number, since it uses less digits than its factorization.

19689943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216393.

The product of its digits is 419904, while the sum is 49.

The square root of 19689943 is about 4437.3351236976. The cubic root of 19689943 is about 270.0317429529.

It can be divided in two parts, 1968 and 9943, that added together give a palindrome (11911).

The spelling of 19689943 in words is "nineteen million, six hundred eighty-nine thousand, nine hundred forty-three".