27138537 has 8 divisors (see below), whose sum is σ = 40205280. Its totient is φ = 18092340.

The previous prime is 27138533. The next prime is 27138557. The reversal of 27138537 is 73583172.

27138537 is a `hidden beast` number, since 271 + 385 + 3 + 7 = 666.

It is not a de Polignac number, because 27138537 - 2² = 27138533 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27138533) 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, 502539 + ... + 502592.

It is an arithmetic number, because the mean of its divisors is an integer number (5025660).

Almost surely, 2^27138537 is an apocalyptic number.

27138537 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

27138537 is a deficient number, since it is larger than the sum of its proper divisors (13066743).

27138537 is a wasteful number, since it uses less digits than its factorization.

27138537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005140 (or 1005134 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 27138537 is about 5209.4660954843. The cubic root of 27138537 is about 300.5122249210.

The spelling of 27138537 in words is "twenty-seven million, one hundred thirty-eight thousand, five hundred thirty-seven".