18879841 has 4 divisors (see below), whose sum is σ = 19530900. Its totient is φ = 18228784.

The previous prime is 18879811. The next prime is 18879857. The reversal of 18879841 is 14897881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8614225 + 10265616 = 2935^2 + 3204^2 .

It is a cyclic number.

It is not a de Polignac number, because 18879841 - 2¹⁹ = 18355553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18879791 and 18879800.

It is not an unprimeable number, because it can be changed into a prime (18879811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325486 + ... + 325543.

It is an arithmetic number, because the mean of its divisors is an integer number (4882725).

Almost surely, 2^18879841 is an apocalyptic number.

It is an amenable number.

18879841 is a deficient number, since it is larger than the sum of its proper divisors (651059).

18879841 is an equidigital number, since it uses as much as digits as its factorization.

18879841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651058.

The product of its digits is 129024, while the sum is 46.

The square root of 18879841 is about 4345.0939000210. The cubic root of 18879841 is about 266.2764617693.

The spelling of 18879841 in words is "eighteen million, eight hundred seventy-nine thousand, eight hundred forty-one".