278349 has 16 divisors (see below), whose sum is σ = 397824. Its totient is φ = 172800.

The previous prime is 278347. The next prime is 278353. The reversal of 278349 is 943872.

It is not a de Polignac number, because 278349 - 2¹ = 278347 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278347) 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 in 15 ways as a sum of consecutive naturals, for example, 3777 + ... + 3849.

It is an arithmetic number, because the mean of its divisors is an integer number (24864).

2²⁷⁸³⁴⁹ is an apocalyptic number.

It is an amenable number.

278349 is a deficient number, since it is larger than the sum of its proper divisors (119475).

278349 is a wasteful number, since it uses less digits than its factorization.

278349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148.

The product of its digits is 12096, while the sum is 33.

The square root of 278349 is about 527.5879073671. The cubic root of 278349 is about 65.2924885847.

Adding to 278349 its reverse (943872), we get a palindrome (1222221).

The spelling of 278349 in words is "two hundred seventy-eight thousand, three hundred forty-nine".