27920197 has 4 divisors (see below), whose sum is σ = 27978016. Its totient is φ = 27862380.

The previous prime is 27920147. The next prime is 27920227. The reversal of 27920197 is 79102972.

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 a de Polignac number, because none of the positive numbers 2^k-27920197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27920117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28179 + ... + 29152.

It is an arithmetic number, because the mean of its divisors is an integer number (6994504).

Almost surely, 2^27920197 is an apocalyptic number.

It is an amenable number.

27920197 is a deficient number, since it is larger than the sum of its proper divisors (57819).

27920197 is an equidigital number, since it uses as much as digits as its factorization.

27920197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57818.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 27920197 is about 5283.9565668162. The cubic root of 27920197 is about 303.3701358827.

The spelling of 27920197 in words is "twenty-seven million, nine hundred twenty thousand, one hundred ninety-seven".