27991039 has 8 divisors (see below), whose sum is σ = 28382112. Its totient is φ = 27602400.

The previous prime is 27991031. The next prime is 27991057. The reversal of 27991039 is 93019972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27991039 - 2³ = 27991031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27990992 and 27991010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27991031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37302 + ... + 38044.

It is an arithmetic number, because the mean of its divisors is an integer number (3547764).

Almost surely, 2^27991039 is an apocalyptic number.

27991039 is a deficient number, since it is larger than the sum of its proper divisors (391073).

27991039 is a wasteful number, since it uses less digits than its factorization.

27991039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 27991039 is about 5290.6558194613. The cubic root of 27991039 is about 303.6264998339.

The spelling of 27991039 in words is "twenty-seven million, nine hundred ninety-one thousand, thirty-nine".