27983231 has 4 divisors (see below), whose sum is σ = 28948200. Its totient is φ = 27018264.

The previous prime is 27983191. The next prime is 27983273. The reversal of 27983231 is 13238972.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27983231 is a prime.

It is a super-2 number, since 2×27983231² = 1566122434398722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27983191 and 27983200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27983531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482441 + ... + 482498.

It is an arithmetic number, because the mean of its divisors is an integer number (7237050).

Almost surely, 2^27983231 is an apocalyptic number.

27983231 is a deficient number, since it is larger than the sum of its proper divisors (964969).

27983231 is an equidigital number, since it uses as much as digits as its factorization.

27983231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964968.

The product of its digits is 18144, while the sum is 35.

The square root of 27983231 is about 5289.9178632565. The cubic root of 27983231 is about 303.5982653671.

The spelling of 27983231 in words is "twenty-seven million, nine hundred eighty-three thousand, two hundred thirty-one".