127983421 has 2 divisors, whose sum is σ = 127983422. Its totient is φ = 127983420.

The previous prime is 127983419. The next prime is 127983439. The reversal of 127983421 is 124389721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70375321 + 57608100 = 8389^2 + 7590^2 .

It is a cyclic number.

It is not a de Polignac number, because 127983421 - 2¹ = 127983419 is a prime.

Together with 127983419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127983451) 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, 63991710 + 63991711.

It is an arithmetic number, because the mean of its divisors is an integer number (63991711).

Almost surely, 2^127983421 is an apocalyptic number.

It is an amenable number.

127983421 is a deficient number, since it is larger than the sum of its proper divisors (1).

127983421 is an equidigital number, since it uses as much as digits as its factorization.

127983421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 127983421 is about 11312.9757800501. The cubic root of 127983421 is about 503.9466604444.

The spelling of 127983421 in words is "one hundred twenty-seven million, nine hundred eighty-three thousand, four hundred twenty-one".