27929947 has 2 divisors, whose sum is σ = 27929948. Its totient is φ = 27929946.

The previous prime is 27929927. The next prime is 27929959. The reversal of 27929947 is 74992972.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27929947 - 2¹⁹ = 27405659 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27929947.

It is not a weakly prime, because it can be changed into another prime (27929927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13964973 + 13964974.

It is an arithmetic number, because the mean of its divisors is an integer number (13964974).

Almost surely, 2^27929947 is an apocalyptic number.

27929947 is a deficient number, since it is larger than the sum of its proper divisors (1).

27929947 is an equidigital number, since it uses as much as digits as its factorization.

27929947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 27929947 is about 5284.8790903861. The cubic root of 27929947 is about 303.4054450246.

The spelling of 27929947 in words is "twenty-seven million, nine hundred twenty-nine thousand, nine hundred forty-seven".