278123 has 2 divisors, whose sum is σ = 278124. Its totient is φ = 278122.

The previous prime is 278119. The next prime is 278143. The reversal of 278123 is 321872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278123 - 2² = 278119 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 7.

It is not a weakly prime, because it can be changed into another prime (278143) 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, 139061 + 139062.

It is an arithmetic number, because the mean of its divisors is an integer number (139062).

2²⁷⁸¹²³ is an apocalyptic number.

278123 is a deficient number, since it is larger than the sum of its proper divisors (1).

278123 is an equidigital number, since it uses as much as digits as its factorization.

278123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 278123 is about 527.3736815580. The cubic root of 278123 is about 65.2748128157.

Adding to 278123 its reverse (321872), we get a palindrome (599995).

It can be divided in two parts, 27812 and 3, that multiplied together give a triangular number (83436 = T₄₀₈).

The spelling of 278123 in words is "two hundred seventy-eight thousand, one hundred twenty-three".