18839845 has 8 divisors (see below), whose sum is σ = 23219064. Its totient is φ = 14664384.

The previous prime is 18839839. The next prime is 18839861. The reversal of 18839845 is 54893881.

It can be written as a sum of positive squares in 4 ways, for example, as 6066369 + 12773476 = 2463^2 + 3574^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18839845 - 2³ = 18839837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18839795 and 18839804.

It is a congruent number.

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, 50734 + ... + 51103.

It is an arithmetic number, because the mean of its divisors is an integer number (2902383).

Almost surely, 2^18839845 is an apocalyptic number.

It is an amenable number.

18839845 is a deficient number, since it is larger than the sum of its proper divisors (4379219).

18839845 is a wasteful number, since it uses less digits than its factorization.

18839845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101879.

The product of its digits is 276480, while the sum is 46.

The square root of 18839845 is about 4340.4890277479. The cubic root of 18839845 is about 266.0882977072.

The spelling of 18839845 in words is "eighteen million, eight hundred thirty-nine thousand, eight hundred forty-five".