19898361 has 18 divisors (see below), whose sum is σ = 33435402. Its totient is φ = 11370240.

The previous prime is 19898357. The next prime is 19898363. The reversal of 19898361 is 16389891.

It can be written as a sum of positive squares in only one way, i.e., 11861136 + 8037225 = 3444^2 + 2835^2 .

It is not a de Polignac number, because 19898361 - 2² = 19898357 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19898363) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22120 + ... + 23001.

Almost surely, 2^19898361 is an apocalyptic number.

It is an amenable number.

19898361 is a deficient number, since it is larger than the sum of its proper divisors (13537041).

19898361 is a wasteful number, since it uses less digits than its factorization.

19898361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45141 (or 45131 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 19898361 is about 4460.7578952461. The cubic root of 19898361 is about 270.9811627089.

The spelling of 19898361 in words is "nineteen million, eight hundred ninety-eight thousand, three hundred sixty-one".