279820 has 24 divisors (see below), whose sum is σ = 622944. Its totient is φ = 105216.

The previous prime is 279817. The next prime is 279823. The reversal of 279820 is 28972.

It is an interprime number because it is at equal distance from previous prime (279817) and next prime (279823).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (279823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72 + ... + 751.

It is an arithmetic number, because the mean of its divisors is an integer number (25956).

2²⁷⁹⁸²⁰ is an apocalyptic number.

279820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

279820 is an abundant number, since it is smaller than the sum of its proper divisors (343124).

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

279820 is a wasteful number, since it uses less digits than its factorization.

279820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 847 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 279820 is about 528.9801508563. The cubic root of 279820 is about 65.4073043430.

The spelling of 279820 in words is "two hundred seventy-nine thousand, eight hundred twenty".