27930391 has 2 divisors, whose sum is σ = 27930392. Its totient is φ = 27930390.

The previous prime is 27930373. The next prime is 27930401. The reversal of 27930391 is 19303972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27930391 - 2⁵ = 27930359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27930341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13965195 + 13965196.

It is an arithmetic number, because the mean of its divisors is an integer number (13965196).

Almost surely, 2^27930391 is an apocalyptic number.

27930391 is a deficient number, since it is larger than the sum of its proper divisors (1).

27930391 is an equidigital number, since it uses as much as digits as its factorization.

27930391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 27930391 is about 5284.9210968566. The cubic root of 27930391 is about 303.4070527529.

The spelling of 27930391 in words is "twenty-seven million, nine hundred thirty thousand, three hundred ninety-one".