27998443 has 4 divisors (see below), whose sum is σ = 30543768. Its totient is φ = 25453120.

The previous prime is 27998437. The next prime is 27998447. The reversal of 27998443 is 34489972.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-27998443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27998393 and 27998402.

It is not an unprimeable number, because it can be changed into a prime (27998447) 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, 1272646 + ... + 1272667.

It is an arithmetic number, because the mean of its divisors is an integer number (7635942).

Almost surely, 2^27998443 is an apocalyptic number.

27998443 is a deficient number, since it is larger than the sum of its proper divisors (2545325).

27998443 is a wasteful number, since it uses less digits than its factorization.

27998443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545324.

The product of its digits is 435456, while the sum is 46.

The square root of 27998443 is about 5291.3554974127. The cubic root of 27998443 is about 303.6532685487.

It can be divided in two parts, 27998 and 443, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 27998443 in words is "twenty-seven million, nine hundred ninety-eight thousand, four hundred forty-three".