19818441 has 6 divisors (see below), whose sum is σ = 28626650. Its totient is φ = 13212288.

The previous prime is 19818439. The next prime is 19818451. The reversal of 19818441 is 14481891.

It can be written as a sum of positive squares in only one way, i.e., 16842816 + 2975625 = 4104^2 + 1725^2 .

It is not a de Polignac number, because 19818441 - 2¹ = 19818439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19818396 and 19818405.

It is not an unprimeable number, because it can be changed into a prime (19818451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1101016 + ... + 1101033.

Almost surely, 2^19818441 is an apocalyptic number.

It is an amenable number.

19818441 is a deficient number, since it is larger than the sum of its proper divisors (8808209).

19818441 is a wasteful number, since it uses less digits than its factorization.

19818441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2202055 (or 2202052 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 19818441 is about 4451.7907632772. The cubic root of 19818441 is about 270.6178853245.

The spelling of 19818441 in words is "nineteen million, eight hundred eighteen thousand, four hundred forty-one".