19698143 has 4 divisors (see below), whose sum is σ = 20554608. Its totient is φ = 18841680.

The previous prime is 19698137. The next prime is 19698157. The reversal of 19698143 is 34189691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19698143 - 2⁴ = 19698127 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 19698143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19698643) 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, 428198 + ... + 428243.

It is an arithmetic number, because the mean of its divisors is an integer number (5138652).

Almost surely, 2^19698143 is an apocalyptic number.

19698143 is a deficient number, since it is larger than the sum of its proper divisors (856465).

19698143 is an equidigital number, since it uses as much as digits as its factorization.

19698143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856464.

The product of its digits is 46656, while the sum is 41.

The square root of 19698143 is about 4438.2590055111. The cubic root of 19698143 is about 270.0692232202.

The spelling of 19698143 in words is "nineteen million, six hundred ninety-eight thousand, one hundred forty-three".