27987139 has 4 divisors (see below), whose sum is σ = 28104480. Its totient is φ = 27869800.

The previous prime is 27987131. The next prime is 27987143. The reversal of 27987139 is 93178972.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27987139 - 2³ = 27987131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27987131) 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, 58312 + ... + 58789.

It is an arithmetic number, because the mean of its divisors is an integer number (7026120).

Almost surely, 2^27987139 is an apocalyptic number.

27987139 is a deficient number, since it is larger than the sum of its proper divisors (117341).

27987139 is a wasteful number, since it uses less digits than its factorization.

27987139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117340.

The product of its digits is 190512, while the sum is 46.

The square root of 27987139 is about 5290.2872322777. The cubic root of 27987139 is about 303.6123977213.

The spelling of 27987139 in words is "twenty-seven million, nine hundred eighty-seven thousand, one hundred thirty-nine".