27399191 has 4 divisors (see below), whose sum is σ = 27412872. Its totient is φ = 27385512.

The previous prime is 27399173. The next prime is 27399209. The reversal of 27399191 is 19199372.

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

It is an interprime number because it is at equal distance from previous prime (27399173) and next prime (27399209).

It is a cyclic number.

It is not a de Polignac number, because 27399191 - 2¹⁴ = 27382807 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 (27399131) 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, 3185 + ... + 8058.

It is an arithmetic number, because the mean of its divisors is an integer number (6853218).

Almost surely, 2^27399191 is an apocalyptic number.

27399191 is a deficient number, since it is larger than the sum of its proper divisors (13681).

27399191 is a wasteful number, since it uses less digits than its factorization.

27399191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13680.

The product of its digits is 30618, while the sum is 41.

The square root of 27399191 is about 5234.4236549977. The cubic root of 27399191 is about 301.4712580558.

The spelling of 27399191 in words is "twenty-seven million, three hundred ninety-nine thousand, one hundred ninety-one".