27820139 has 4 divisors (see below), whose sum is σ = 27952200. Its totient is φ = 27688080.

The previous prime is 27820127. The next prime is 27820141. The reversal of 27820139 is 93102872.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27820139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27120139) 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, 65714 + ... + 66135.

It is an arithmetic number, because the mean of its divisors is an integer number (6988050).

Almost surely, 2^27820139 is an apocalyptic number.

27820139 is a deficient number, since it is larger than the sum of its proper divisors (132061).

27820139 is a wasteful number, since it uses less digits than its factorization.

27820139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132060.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 27820139 is about 5274.4799743671. The cubic root of 27820139 is about 303.0073048448.

The spelling of 27820139 in words is "twenty-seven million, eight hundred twenty thousand, one hundred thirty-nine".