27930431 has 2 divisors, whose sum is σ = 27930432. Its totient is φ = 27930430.

The previous prime is 27930421. The next prime is 27930433. The reversal of 27930431 is 13403972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27930431 - 2²² = 23736127 is a prime.

It is a super-2 number, since 2×27930431² = 1560217951691522, which contains 22 as substring.

Together with 27930433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27930394 and 27930403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27930433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13965215 + 13965216.

It is an arithmetic number, because the mean of its divisors is an integer number (13965216).

Almost surely, 2^27930431 is an apocalyptic number.

27930431 is a deficient number, since it is larger than the sum of its proper divisors (1).

27930431 is an equidigital number, since it uses as much as digits as its factorization.

27930431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 27930431 is about 5284.9248812069. The cubic root of 27930431 is about 303.4071975925.

The spelling of 27930431 in words is "twenty-seven million, nine hundred thirty thousand, four hundred thirty-one".