27998447 has 2 divisors, whose sum is σ = 27998448. Its totient is φ = 27998446.

The previous prime is 27998437. The next prime is 27998459. The reversal of 27998447 is 74489972.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27998447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27998395 and 27998404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27998437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13999223 + 13999224.

It is an arithmetic number, because the mean of its divisors is an integer number (13999224).

Almost surely, 2^27998447 is an apocalyptic number.

27998447 is a deficient number, since it is larger than the sum of its proper divisors (1).

27998447 is an equidigital number, since it uses as much as digits as its factorization.

27998447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 50.

The square root of 27998447 is about 5291.3558753877. The cubic root of 27998447 is about 303.6532830092.

The spelling of 27998447 in words is "twenty-seven million, nine hundred ninety-eight thousand, four hundred forty-seven".