27830381 has 4 divisors (see below), whose sum is σ = 27918492. Its totient is φ = 27742272.

The previous prime is 27830351. The next prime is 27830423. The reversal of 27830381 is 18303872.

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

It can be written as a sum of positive squares in 2 ways, for example, as 477481 + 27352900 = 691^2 + 5230^2 .

It is a cyclic number.

It is not a de Polignac number, because 27830381 - 2²² = 23636077 is a prime.

It is a super-2 number, since 2×27830381² = 1549060213210322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27830351) 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, 43580 + ... + 44213.

It is an arithmetic number, because the mean of its divisors is an integer number (6979623).

Almost surely, 2^27830381 is an apocalyptic number.

It is an amenable number.

27830381 is a deficient number, since it is larger than the sum of its proper divisors (88111).

27830381 is an equidigital number, since it uses as much as digits as its factorization.

27830381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88110.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 27830381 is about 5275.4507864257. The cubic root of 27830381 is about 303.0444843865.

The spelling of 27830381 in words is "twenty-seven million, eight hundred thirty thousand, three hundred eighty-one".