27939947 has 18 divisors (see below), whose sum is σ = 33260868. Its totient is φ = 23399712.

The previous prime is 27939943. The next prime is 27939971. The reversal of 27939947 is 74993972.

It is not a de Polignac number, because 27939947 - 2² = 27939943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27939895 and 27939904.

It is not an unprimeable number, because it can be changed into a prime (27939943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 261068 + ... + 261174.

It is an arithmetic number, because the mean of its divisors is an integer number (1847826).

Almost surely, 2^27939947 is an apocalyptic number.

27939947 is a deficient number, since it is larger than the sum of its proper divisors (5320921).

27939947 is an equidigital number, since it uses as much as digits as its factorization.

27939947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 187 counting only the distinct ones).

The product of its digits is 857304, while the sum is 50.

The square root of 27939947 is about 5285.8251011550. The cubic root of 27939947 is about 303.4416509940.

The spelling of 27939947 in words is "twenty-seven million, nine hundred thirty-nine thousand, nine hundred forty-seven".