127820477 has 2 divisors, whose sum is σ = 127820478. Its totient is φ = 127820476.

The previous prime is 127820417. The next prime is 127820479. The reversal of 127820477 is 774028721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93586276 + 34234201 = 9674^2 + 5851^2 .

It is a cyclic number.

It is not a de Polignac number, because 127820477 - 2⁸ = 127820221 is a prime.

Together with 127820479, it forms a pair of twin primes.

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 127820477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127820479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63910238 + 63910239.

It is an arithmetic number, because the mean of its divisors is an integer number (63910239).

Almost surely, 2^127820477 is an apocalyptic number.

It is an amenable number.

127820477 is a deficient number, since it is larger than the sum of its proper divisors (1).

127820477 is an equidigital number, since it uses as much as digits as its factorization.

127820477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43904, while the sum is 38.

The square root of 127820477 is about 11305.7718445049. The cubic root of 127820477 is about 503.7327005493.

The spelling of 127820477 in words is "one hundred twenty-seven million, eight hundred twenty thousand, four hundred seventy-seven".