278413 has 2 divisors, whose sum is σ = 278414.
Its totient is φ = 278412.
The previous prime is 278393. The next prime is 278437. The reversal of 278413 is 314872.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 272484 + 5929 = 522^2 + 77^2
It is a cyclic number.
It is not a de Polignac number, because 278413 - 217 = 147341 is a prime.
278413 is a lucky number.
It is a nialpdrome in base 13.
It is a zygodrome in base 13.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (278813) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139206 + 139207.
It is an arithmetic number, because the mean of its divisors is an integer number (139207).
2278413 is an apocalyptic number.
It is an amenable number.
278413 is a deficient number, since it is larger than the sum of its proper divisors (1).
278413 is an equidigital number, since it uses as much as digits as its factorization.
278413 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 1344, while the sum is 25.
The square root of 278413 is about 527.6485572803.
The cubic root of 278413 is about 65.2974923738.
The spelling of 278413 in words is "two hundred seventy-eight thousand, four hundred thirteen".