27042381 has 12 divisors (see below), whose sum is σ = 39234780. Its totient is φ = 17948160.

The previous prime is 27042373. The next prime is 27042391. The reversal of 27042381 is 18324072.

It can be written as a sum of positive squares in 2 ways, for example, as 15139881 + 11902500 = 3891^2 + 3450^2 .

It is not a de Polignac number, because 27042381 - 2³ = 27042373 is a prime.

It is a super-2 number, since 2×27042381² = 1462580740298322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27042331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4500 + ... + 8621.

It is an arithmetic number, because the mean of its divisors is an integer number (3269565).

Almost surely, 2^27042381 is an apocalyptic number.

It is an amenable number.

27042381 is a deficient number, since it is larger than the sum of its proper divisors (12192399).

27042381 is a wasteful number, since it uses less digits than its factorization.

27042381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13356 (or 13353 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 27042381 is about 5200.2289372681. The cubic root of 27042381 is about 300.1568846098.

The spelling of 27042381 in words is "twenty-seven million, forty-two thousand, three hundred eighty-one".