27981593 has 4 divisors (see below), whose sum is σ = 29198208. Its totient is φ = 26764980.

The previous prime is 27981587. The next prime is 27981601. The reversal of 27981593 is 39518972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27981593 - 2¹² = 27977497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27981523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 608273 + ... + 608318.

It is an arithmetic number, because the mean of its divisors is an integer number (7299552).

Almost surely, 2^27981593 is an apocalyptic number.

27981593 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

27981593 is a deficient number, since it is larger than the sum of its proper divisors (1216615).

27981593 is a wasteful number, since it uses less digits than its factorization.

27981593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216614.

The product of its digits is 136080, while the sum is 44.

The square root of 27981593 is about 5289.7630381710. The cubic root of 27981593 is about 303.5923415377.

The spelling of 27981593 in words is "twenty-seven million, nine hundred eighty-one thousand, five hundred ninety-three".