127989877 has 2 divisors, whose sum is σ = 127989878. Its totient is φ = 127989876.

The previous prime is 127989853. The next prime is 127989881. The reversal of 127989877 is 778989721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79673476 + 48316401 = 8926^2 + 6951^2 .

It is a cyclic number.

It is not a de Polignac number, because 127989877 - 2⁷ = 127989749 is a prime.

It is a super-2 number, since 2×127989877² = 32762817228950258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127980877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63994938 + 63994939.

It is an arithmetic number, because the mean of its divisors is an integer number (63994939).

Almost surely, 2^127989877 is an apocalyptic number.

It is an amenable number.

127989877 is a deficient number, since it is larger than the sum of its proper divisors (1).

127989877 is an equidigital number, since it uses as much as digits as its factorization.

127989877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 58.

The square root of 127989877 is about 11313.2611125175. The cubic root of 127989877 is about 503.9551340027.

The spelling of 127989877 in words is "one hundred twenty-seven million, nine hundred eighty-nine thousand, eight hundred seventy-seven".