127787893 has 2 divisors, whose sum is σ = 127787894. Its totient is φ = 127787892.

The previous prime is 127787867. The next prime is 127787903. The reversal of 127787893 is 398787721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86545809 + 41242084 = 9303^2 + 6422^2 .

It is an emirp because it is prime and its reverse (398787721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127787893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 127787893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127787993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63893946 + 63893947.

It is an arithmetic number, because the mean of its divisors is an integer number (63893947).

Almost surely, 2^127787893 is an apocalyptic number.

It is an amenable number.

127787893 is a deficient number, since it is larger than the sum of its proper divisors (1).

127787893 is an equidigital number, since it uses as much as digits as its factorization.

127787893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 52.

The square root of 127787893 is about 11304.3307187998. The cubic root of 127787893 is about 503.6898930597.

The spelling of 127787893 in words is "one hundred twenty-seven million, seven hundred eighty-seven thousand, eight hundred ninety-three".