27873121 has 4 divisors (see below), whose sum is σ = 27883972. Its totient is φ = 27862272.

The previous prime is 27873113. The next prime is 27873127. The reversal of 27873121 is 12137872.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12702096 + 15171025 = 3564^2 + 3895^2 .

It is a cyclic number.

It is not a de Polignac number, because 27873121 - 2³ = 27873113 is a prime.

It is the 5280-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27873127) by changing a digit.

It is a nontrivial repunit in base 5279.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 841 + ... + 7513.

It is an arithmetic number, because the mean of its divisors is an integer number (6970993).

Almost surely, 2^27873121 is an apocalyptic number.

It is an amenable number.

27873121 is a deficient number, since it is larger than the sum of its proper divisors (10851).

27873121 is an equidigital number, since it uses as much as digits as its factorization.

27873121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10850.

The product of its digits is 4704, while the sum is 31.

The square root of 27873121 is about 5279.5000710295. The cubic root of 27873121 is about 303.1995367205.

The spelling of 27873121 in words is "twenty-seven million, eight hundred seventy-three thousand, one hundred twenty-one".