27917939 has 4 divisors (see below), whose sum is σ = 31906224. Its totient is φ = 23929656.

The previous prime is 27917933. The next prime is 27917941. The reversal of 27917939 is 93971972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27917939 - 2¹² = 27913843 is a prime.

It is a super-2 number, since 2×27917939² = 1558822636015442, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27917893 and 27917902.

It is not an unprimeable number, because it can be changed into a prime (27917933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1994132 + ... + 1994145.

It is an arithmetic number, because the mean of its divisors is an integer number (7976556).

Almost surely, 2^27917939 is an apocalyptic number.

27917939 is a deficient number, since it is larger than the sum of its proper divisors (3988285).

27917939 is an equidigital number, since it uses as much as digits as its factorization.

27917939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988284.

The product of its digits is 214326, while the sum is 47.

The square root of 27917939 is about 5283.7428968488. The cubic root of 27917939 is about 303.3619574754.

The spelling of 27917939 in words is "twenty-seven million, nine hundred seventeen thousand, nine hundred thirty-nine".