27811397 has 4 divisors (see below), whose sum is σ = 28163520. Its totient is φ = 27459276.

The previous prime is 27811387. The next prime is 27811403. The reversal of 27811397 is 79311872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27811397 - 2⁸ = 27811141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27811397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27811327) 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, 175943 + ... + 176100.

It is an arithmetic number, because the mean of its divisors is an integer number (7040880).

Almost surely, 2^27811397 is an apocalyptic number.

It is an amenable number.

27811397 is a deficient number, since it is larger than the sum of its proper divisors (352123).

27811397 is an equidigital number, since it uses as much as digits as its factorization.

27811397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352122.

The product of its digits is 21168, while the sum is 38.

The square root of 27811397 is about 5273.6512019662. The cubic root of 27811397 is about 302.9755632425.

The spelling of 27811397 in words is "twenty-seven million, eight hundred eleven thousand, three hundred ninety-seven".