19898449 has 4 divisors (see below), whose sum is σ = 21068964. Its totient is φ = 18727936.

The previous prime is 19898443. The next prime is 19898471. The reversal of 19898449 is 94489891.

It is a happy number.

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 18318400 + 1580049 = 4280^2 + 1257^2 .

It is a cyclic number.

It is not a de Polignac number, because 19898449 - 2⁹ = 19897937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19898396 and 19898405.

It is not an unprimeable number, because it can be changed into a prime (19898443) 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 3 ways as a sum of consecutive naturals, for example, 585232 + ... + 585265.

It is an arithmetic number, because the mean of its divisors is an integer number (5267241).

Almost surely, 2^19898449 is an apocalyptic number.

It is an amenable number.

19898449 is a deficient number, since it is larger than the sum of its proper divisors (1170515).

19898449 is a wasteful number, since it uses less digits than its factorization.

19898449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170514.

The product of its digits is 746496, while the sum is 52.

The square root of 19898449 is about 4460.7677590298. The cubic root of 19898449 is about 270.9815621775.

The spelling of 19898449 in words is "nineteen million, eight hundred ninety-eight thousand, four hundred forty-nine".