279499985 has 4 divisors (see below), whose sum is σ = 335399988. Its totient is φ = 223599984.

The previous prime is 279499939. The next prime is 279500021. The reversal of 279499985 is 589994972.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56535361 + 222964624 = 7519^2 + 14932^2 .

It is a cyclic number.

It is not a de Polignac number, because 279499985 - 2⁶ = 279499921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27949994 + ... + 27950003.

It is an arithmetic number, because the mean of its divisors is an integer number (83849997).

Almost surely, 2^279499985 is an apocalyptic number.

It is an amenable number.

279499985 is a deficient number, since it is larger than the sum of its proper divisors (55900003).

279499985 is an equidigital number, since it uses as much as digits as its factorization.

279499985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55900002.

The product of its digits is 14696640, while the sum is 62.

The square root of 279499985 is about 16718.2530486890. The cubic root of 279499985 is about 653.8236056620.

The spelling of 279499985 in words is "two hundred seventy-nine million, four hundred ninety-nine thousand, nine hundred eighty-five".