19800159 has 4 divisors (see below), whose sum is σ = 26400216. Its totient is φ = 13200104.

The previous prime is 19800139. The next prime is 19800161. The reversal of 19800159 is 95100891.

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 19800159 - 2¹⁷ = 19669087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19800119) 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, 3300024 + ... + 3300029.

It is an arithmetic number, because the mean of its divisors is an integer number (6600054).

Almost surely, 2^19800159 is an apocalyptic number.

19800159 is a deficient number, since it is larger than the sum of its proper divisors (6600057).

19800159 is an equidigital number, since it uses as much as digits as its factorization.

19800159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6600056.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 19800159 is about 4449.7369585179. The cubic root of 19800159 is about 270.5346470540.

The spelling of 19800159 in words is "nineteen million, eight hundred thousand, one hundred fifty-nine".