278422 has 8 divisors (see below), whose sum is σ = 423576. Its totient is φ = 137232.

The previous prime is 278413. The next prime is 278437. The reversal of 278422 is 224872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 808 + ... + 1099.

It is an arithmetic number, because the mean of its divisors is an integer number (52947).

2²⁷⁸⁴²² is an apocalyptic number.

278422 is a deficient number, since it is larger than the sum of its proper divisors (145154).

278422 is a wasteful number, since it uses less digits than its factorization.

278422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982.

The product of its digits is 1792, while the sum is 25.

The square root of 278422 is about 527.6570856153. The cubic root of 278422 is about 65.2981959701.

The spelling of 278422 in words is "two hundred seventy-eight thousand, four hundred twenty-two".