27958919 has 2 divisors, whose sum is σ = 27958920. Its totient is φ = 27958918.

The previous prime is 27958913. The next prime is 27958943. The reversal of 27958919 is 91985972.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27958919 - 2⁸ = 27958663 is a prime.

It is a super-2 number, since 2×27958919² = 1563402303297122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27958913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13979459 + 13979460.

It is an arithmetic number, because the mean of its divisors is an integer number (13979460).

Almost surely, 2^27958919 is an apocalyptic number.

27958919 is a deficient number, since it is larger than the sum of its proper divisors (1).

27958919 is an equidigital number, since it uses as much as digits as its factorization.

27958919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The square root of 27958919 is about 5287.6194076352. The cubic root of 27958919 is about 303.5103172238.

The spelling of 27958919 in words is "twenty-seven million, nine hundred fifty-eight thousand, nine hundred nineteen".