19898145 has 12 divisors (see below), whose sum is σ = 34490196. Its totient is φ = 10612320.

The previous prime is 19898101. The next prime is 19898159. The reversal of 19898145 is 54189891.

19898145 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 5992704 + 13905441 = 2448^2 + 3729^2 .

It is not a de Polignac number, because 19898145 - 2¹³ = 19889953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 442181 = 19898145 / (1 + 9 + 8 + 9 + 8 + 1 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 19898145.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 221046 + ... + 221135.

It is an arithmetic number, because the mean of its divisors is an integer number (2874183).

Almost surely, 2^19898145 is an apocalyptic number.

19898145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19898145 is a deficient number, since it is larger than the sum of its proper divisors (14592051).

19898145 is a wasteful number, since it uses less digits than its factorization.

19898145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442192 (or 442189 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 19898145 is about 4460.7336840480. The cubic root of 19898145 is about 270.9801821903.

The spelling of 19898145 in words is "nineteen million, eight hundred ninety-eight thousand, one hundred forty-five".