27979957 has 2 divisors, whose sum is σ = 27979958. Its totient is φ = 27979956.

The previous prime is 27979933. The next prime is 27979961. The reversal of 27979957 is 75997972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20439441 + 7540516 = 4521^2 + 2746^2 .

It is a cyclic number.

It is not a de Polignac number, because 27979957 - 2⁷ = 27979829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27979898 and 27979907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27979057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13989978 + 13989979.

It is an arithmetic number, because the mean of its divisors is an integer number (13989979).

Almost surely, 2^27979957 is an apocalyptic number.

It is an amenable number.

27979957 is a deficient number, since it is larger than the sum of its proper divisors (1).

27979957 is an equidigital number, since it uses as much as digits as its factorization.

27979957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2500470, while the sum is 55.

The square root of 27979957 is about 5289.6083976037. The cubic root of 27979957 is about 303.5864247105.

The spelling of 27979957 in words is "twenty-seven million, nine hundred seventy-nine thousand, nine hundred fifty-seven".