27981419 has 2 divisors, whose sum is σ = 27981420. Its totient is φ = 27981418.

The previous prime is 27981413. The next prime is 27981427. The reversal of 27981419 is 91418972.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27981419 is a prime.

It is a super-2 number, since 2×27981419² = 1565919618507122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27981413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13990709 + 13990710.

It is an arithmetic number, because the mean of its divisors is an integer number (13990710).

Almost surely, 2^27981419 is an apocalyptic number.

27981419 is a deficient number, since it is larger than the sum of its proper divisors (1).

27981419 is an equidigital number, since it uses as much as digits as its factorization.

27981419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 27981419 is about 5289.7465912839. The cubic root of 27981419 is about 303.5917122529.

The spelling of 27981419 in words is "twenty-seven million, nine hundred eighty-one thousand, four hundred nineteen".