78421127 has 2 divisors, whose sum is σ = 78421128. Its totient is φ = 78421126.

The previous prime is 78421117. The next prime is 78421141. The reversal of 78421127 is 72112487.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78421127 - 2¹⁴ = 78404743 is a prime.

It is a super-2 number, since 2×78421127² = 12299746319900258, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78421093 and 78421102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78421117) 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, 39210563 + 39210564.

It is an arithmetic number, because the mean of its divisors is an integer number (39210564).

Almost surely, 2^78421127 is an apocalyptic number.

78421127 is a deficient number, since it is larger than the sum of its proper divisors (1).

78421127 is an equidigital number, since it uses as much as digits as its factorization.

78421127 is an odious number, because the sum of its binary digits is odd.

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

The square root of 78421127 is about 8855.5703938256. The cubic root of 78421127 is about 428.0334337145.

The spelling of 78421127 in words is "seventy-eight million, four hundred twenty-one thousand, one hundred twenty-seven".