27989381 has 8 divisors (see below), whose sum is σ = 32287680. Its totient is φ = 23766048.

The previous prime is 27989371. The next prime is 27989389. The reversal of 27989381 is 18398972.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27989381 is a prime.

It is a super-2 number, since 2×27989381² = 1566810897526322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27989389) 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, 17936 + ... + 19433.

It is an arithmetic number, because the mean of its divisors is an integer number (4035960).

Almost surely, 2^27989381 is an apocalyptic number.

It is an amenable number.

27989381 is a deficient number, since it is larger than the sum of its proper divisors (4298299).

27989381 is a wasteful number, since it uses less digits than its factorization.

27989381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37483.

The product of its digits is 217728, while the sum is 47.

The square root of 27989381 is about 5290.4991257914. The cubic root of 27989381 is about 303.6205047881.

The spelling of 27989381 in words is "twenty-seven million, nine hundred eighty-nine thousand, three hundred eighty-one".