19972843 has 8 divisors (see below), whose sum is σ = 21861936. Its totient is φ = 18096000.

The previous prime is 19972837. The next prime is 19972853. The reversal of 19972843 is 34827991.

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

It is a cyclic number.

It is not a de Polignac number, because 19972843 - 2²¹ = 17875691 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 19972843.

It is not an unprimeable number, because it can be changed into a prime (19972853) 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, 543 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (2732742).

Almost surely, 2^19972843 is an apocalyptic number.

19972843 is a deficient number, since it is larger than the sum of its proper divisors (1889093).

19972843 is a wasteful number, since it uses less digits than its factorization.

19972843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6125.

The product of its digits is 108864, while the sum is 43.

The square root of 19972843 is about 4469.0986787047. The cubic root of 19972843 is about 271.3188469441.

The spelling of 19972843 in words is "nineteen million, nine hundred seventy-two thousand, eight hundred forty-three".