78427 has 2 divisors, whose sum is σ = 78428. Its totient is φ = 78426.

The previous prime is 78401. The next prime is 78437. The reversal of 78427 is 72487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78427 - 2¹¹ = 76379 is a prime.

It is equal to p₇₆₉₆ and since 78427 and 7696 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 78395 and 78404.

It is not a weakly prime, because it can be changed into another prime (78437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39213 + 39214.

It is an arithmetic number, because the mean of its divisors is an integer number (39214).

2⁷⁸⁴²⁷ is an apocalyptic number.

78427 is a deficient number, since it is larger than the sum of its proper divisors (1).

78427 is an equidigital number, since it uses as much as digits as its factorization.

78427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 28.

The square root of 78427 is about 280.0482101353. The cubic root of 78427 is about 42.8044118665.

It can be divided in two parts, 78 and 427, that added together give a palindrome (505).

The spelling of 78427 in words is "seventy-eight thousand, four hundred twenty-seven".