18878441 has 4 divisors (see below), whose sum is σ = 19234692. Its totient is φ = 18522192.

The previous prime is 18878437. The next prime is 18878467. The reversal of 18878441 is 14487881.

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 11155600 + 7722841 = 3340^2 + 2779^2 .

It is a cyclic number.

It is not a de Polignac number, because 18878441 - 2² = 18878437 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18878471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178046 + ... + 178151.

It is an arithmetic number, because the mean of its divisors is an integer number (4808673).

Almost surely, 2^18878441 is an apocalyptic number.

It is an amenable number.

18878441 is a deficient number, since it is larger than the sum of its proper divisors (356251).

18878441 is an equidigital number, since it uses as much as digits as its factorization.

18878441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356250.

The product of its digits is 57344, while the sum is 41.

The square root of 18878441 is about 4344.9327957979. The cubic root of 18878441 is about 266.2698798590.

The spelling of 18878441 in words is "eighteen million, eight hundred seventy-eight thousand, four hundred forty-one".