19898225 has 24 divisors (see below), whose sum is σ = 26233440. Its totient is φ = 14929920.

The previous prime is 19898213. The next prime is 19898227. The reversal of 19898225 is 52289891.

It is not a de Polignac number, because 19898225 - 2¹⁶ = 19832689 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (19898227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77297 + ... + 77553.

It is an arithmetic number, because the mean of its divisors is an integer number (1093060).

Almost surely, 2^19898225 is an apocalyptic number.

It is an amenable number.

19898225 is a deficient number, since it is larger than the sum of its proper divisors (6335215).

19898225 is a wasteful number, since it uses less digits than its factorization.

19898225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 444 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The square root of 19898225 is about 4460.7426511737. The cubic root of 19898225 is about 270.9805453462.

The spelling of 19898225 in words is "nineteen million, eight hundred ninety-eight thousand, two hundred twenty-five".