19868945 has 8 divisors (see below), whose sum is σ = 23866920. Its totient is φ = 15879040.

The previous prime is 19868939. The next prime is 19868957. The reversal of 19868945 is 54986891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6880129 + 12988816 = 2623^2 + 3604^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19868945 - 2¹⁰ = 19867921 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19868893 and 19868902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7451 + ... + 9759.

It is an arithmetic number, because the mean of its divisors is an integer number (2983365).

Almost surely, 2^19868945 is an apocalyptic number.

It is an amenable number.

19868945 is a deficient number, since it is larger than the sum of its proper divisors (3997975).

19868945 is a wasteful number, since it uses less digits than its factorization.

19868945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4035.

The product of its digits is 622080, while the sum is 50.

The square root of 19868945 is about 4457.4594782230. The cubic root of 19868945 is about 270.8475652219.

The spelling of 19868945 in words is "nineteen million, eight hundred sixty-eight thousand, nine hundred forty-five".