27949 has 4 divisors (see below), whose sum is σ = 29440. Its totient is φ = 26460.

The previous prime is 27947. The next prime is 27953. The reversal of 27949 is 94972.

27949 = T₁₃₅ + T₁₃₆ + T₁₃₇.

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 27949 - 2¹ = 27947 is a prime.

It is a super-2 number, since 2×27949² = 1562293202, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 27949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27941) 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, 717 + ... + 754.

It is an arithmetic number, because the mean of its divisors is an integer number (7360).

2²⁷⁹⁴⁹ is an apocalyptic number.

27949 is the 137-th centered triangular number.

It is an amenable number.

27949 is a deficient number, since it is larger than the sum of its proper divisors (1491).

27949 is a wasteful number, since it uses less digits than its factorization.

27949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490.

The product of its digits is 4536, while the sum is 31.

The square root of 27949 is about 167.1795442032. The cubic root of 27949 is about 30.3474420808.

The spelling of 27949 in words is "twenty-seven thousand, nine hundred forty-nine".