27972017 has 4 divisors (see below), whose sum is σ = 28052976. Its totient is φ = 27891060.

The previous prime is 27971989. The next prime is 27972023. The reversal of 27972017 is 71027972.

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 27972017 - 2⁸ = 27971761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27974017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39959 + ... + 40652.

It is an arithmetic number, because the mean of its divisors is an integer number (7013244).

Almost surely, 2^27972017 is an apocalyptic number.

It is an amenable number.

27972017 is a deficient number, since it is larger than the sum of its proper divisors (80959).

27972017 is an equidigital number, since it uses as much as digits as its factorization.

27972017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80958.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 27972017 is about 5288.8578162019. The cubic root of 27972017 is about 303.5577052923.

Adding to 27972017 its reverse (71027972), we get a palindrome (98999989).

The spelling of 27972017 in words is "twenty-seven million, nine hundred seventy-two thousand, seventeen".