19819441 has 16 divisors (see below), whose sum is σ = 21369600. Its totient is φ = 18345600.

The previous prime is 19819421. The next prime is 19819453. The reversal of 19819441 is 14491891.

It is a cyclic number.

It is not a de Polignac number, because 19819441 - 2¹³ = 19811249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19819441.

It is not an unprimeable number, because it can be changed into a prime (19819421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93826 + ... + 94036.

It is an arithmetic number, because the mean of its divisors is an integer number (1335600).

Almost surely, 2^19819441 is an apocalyptic number.

It is an amenable number.

19819441 is a deficient number, since it is larger than the sum of its proper divisors (1550159).

19819441 is a wasteful number, since it uses less digits than its factorization.

19819441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360.

The product of its digits is 10368, while the sum is 37.

The square root of 19819441 is about 4451.9030762136. The cubic root of 19819441 is about 270.6224368654.

The spelling of 19819441 in words is "nineteen million, eight hundred nineteen thousand, four hundred forty-one".