19800249 has 8 divisors (see below), whose sum is σ = 30171840. Its totient is φ = 11314416.

The previous prime is 19800247. The next prime is 19800251. The reversal of 19800249 is 94200891.

It is an interprime number because it is at equal distance from previous prime (19800247) and next prime (19800251).

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

It is not a de Polignac number, because 19800249 - 2¹ = 19800247 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19800241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471414 + ... + 471455.

It is an arithmetic number, because the mean of its divisors is an integer number (3771480).

Almost surely, 2^19800249 is an apocalyptic number.

It is an amenable number.

19800249 is a deficient number, since it is larger than the sum of its proper divisors (10371591).

19800249 is an equidigital number, since it uses as much as digits as its factorization.

19800249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942879.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 19800249 is about 4449.7470714637. The cubic root of 19800249 is about 270.5350569511.

The spelling of 19800249 in words is "nineteen million, eight hundred thousand, two hundred forty-nine".