19868249 has 4 divisors (see below), whose sum is σ = 20194020. Its totient is φ = 19542480.

The previous prime is 19868239. The next prime is 19868267. The reversal of 19868249 is 94286891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 225625 + 19642624 = 475^2 + 4432^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19868249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19868239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162794 + ... + 162915.

It is an arithmetic number, because the mean of its divisors is an integer number (5048505).

Almost surely, 2^19868249 is an apocalyptic number.

It is an amenable number.

19868249 is a deficient number, since it is larger than the sum of its proper divisors (325771).

19868249 is an equidigital number, since it uses as much as digits as its factorization.

19868249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325770.

The product of its digits is 248832, while the sum is 47.

The square root of 19868249 is about 4457.3814061621. The cubic root of 19868249 is about 270.8444026298.

The spelling of 19868249 in words is "nineteen million, eight hundred sixty-eight thousand, two hundred forty-nine".