27931391 has 8 divisors (see below), whose sum is σ = 29775600. Its totient is φ = 26109568.

The previous prime is 27931363. The next prime is 27931439. The reversal of 27931391 is 19313972.

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

It is not a de Polignac number, because 27931391 - 2⁶ = 27931327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27931091) 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, 2981 + ... + 8046.

It is an arithmetic number, because the mean of its divisors is an integer number (3721950).

Almost surely, 2^27931391 is an apocalyptic number.

27931391 is a deficient number, since it is larger than the sum of its proper divisors (1844209).

27931391 is a wasteful number, since it uses less digits than its factorization.

27931391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11193.

The product of its digits is 10206, while the sum is 35.

The square root of 27931391 is about 5285.0157048016. The cubic root of 27931391 is about 303.4106737003.

The spelling of 27931391 in words is "twenty-seven million, nine hundred thirty-one thousand, three hundred ninety-one".