278983 has 4 divisors (see below), whose sum is σ = 280440. Its totient is φ = 277528.

The previous prime is 278981. The next prime is 279001. The reversal of 278983 is 389872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 278983 - 2¹ = 278981 is a prime.

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

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388 + ... + 841.

It is an arithmetic number, because the mean of its divisors is an integer number (70110).

2²⁷⁸⁹⁸³ is an apocalyptic number.

278983 is a deficient number, since it is larger than the sum of its proper divisors (1457).

278983 is a wasteful number, since it uses less digits than its factorization.

278983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456.

The product of its digits is 24192, while the sum is 37.

The square root of 278983 is about 528.1884133527. The cubic root of 278983 is about 65.3420235791.

Subtracting 278983 from its reverse (389872), we obtain a square (110889 = 333²).

The spelling of 278983 in words is "two hundred seventy-eight thousand, nine hundred eighty-three".