127820417 has 2 divisors, whose sum is σ = 127820418. Its totient is φ = 127820416.

The previous prime is 127820387. The next prime is 127820477. The reversal of 127820417 is 714028721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73119601 + 54700816 = 8551^2 + 7396^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127820417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (127820477) 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 as a sum of consecutive naturals, namely, 63910208 + 63910209.

It is an arithmetic number, because the mean of its divisors is an integer number (63910209).

Almost surely, 2^127820417 is an apocalyptic number.

It is an amenable number.

127820417 is a deficient number, since it is larger than the sum of its proper divisors (1).

127820417 is an equidigital number, since it uses as much as digits as its factorization.

127820417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 127820417 is about 11305.7691909927. The cubic root of 127820417 is about 503.7326217305.

The spelling of 127820417 in words is "one hundred twenty-seven million, eight hundred twenty thousand, four hundred seventeen".