27981299 has 4 divisors (see below), whose sum is σ = 28269864. Its totient is φ = 27692736.

The previous prime is 27981293. The next prime is 27981301. The reversal of 27981299 is 99218972.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 27981299 - 2²⁰ = 26932723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27981293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144137 + ... + 144330.

It is an arithmetic number, because the mean of its divisors is an integer number (7067466).

Almost surely, 2^27981299 is an apocalyptic number.

27981299 is a deficient number, since it is larger than the sum of its proper divisors (288565).

27981299 is an equidigital number, since it uses as much as digits as its factorization.

27981299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288564.

The product of its digits is 163296, while the sum is 47.

The square root of 27981299 is about 5289.7352485734. The cubic root of 27981299 is about 303.5912782618.

The spelling of 27981299 in words is "twenty-seven million, nine hundred eighty-one thousand, two hundred ninety-nine".