279978 has 8 divisors (see below), whose sum is σ = 559968. Its totient is φ = 93324.

The previous prime is 279977. The next prime is 279991. The reversal of 279978 is 879972.

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

279978 is an admirable number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 279978.

It is not an unprimeable number, because it can be changed into a prime (279977) 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, 23326 + ... + 23337.

It is an arithmetic number, because the mean of its divisors is an integer number (69996).

2²⁷⁹⁹⁷⁸ is an apocalyptic number.

279978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

279978 is a wasteful number, since it uses less digits than its factorization.

279978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46668.

The product of its digits is 63504, while the sum is 42.

The square root of 279978 is about 529.1294737585. The cubic root of 279978 is about 65.4196127432.

Subtracting from 279978 its sum of digits (42), we obtain a 7-th power (279936 = 6⁷).

The spelling of 279978 in words is "two hundred seventy-nine thousand, nine hundred seventy-eight".