279997 has 4 divisors (see below), whose sum is σ = 281536. Its totient is φ = 278460.

The previous prime is 279991. The next prime is 280001. The reversal of 279997 is 799972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 279997 - 2¹⁵ = 247229 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279991) 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, 453 + ... + 874.

It is an arithmetic number, because the mean of its divisors is an integer number (70384).

2²⁷⁹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

279997 is a deficient number, since it is larger than the sum of its proper divisors (1539).

279997 is a wasteful number, since it uses less digits than its factorization.

279997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538.

The product of its digits is 71442, while the sum is 43.

The square root of 279997 is about 529.1474274718. The cubic root of 279997 is about 65.4210925553.

The spelling of 279997 in words is "two hundred seventy-nine thousand, nine hundred ninety-seven".