279868989 has 8 divisors (see below), whose sum is σ = 373823712. Its totient is φ = 186246800.

The previous prime is 279868921. The next prime is 279868997. The reversal of 279868989 is 989868972.

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

It is a cyclic number.

It is not a de Polignac number, because 279868989 - 2¹³ = 279860797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279868189) 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, 81162 + ... + 84539.

It is an arithmetic number, because the mean of its divisors is an integer number (46727964).

Almost surely, 2^279868989 is an apocalyptic number.

It is an amenable number.

279868989 is a deficient number, since it is larger than the sum of its proper divisors (93954723).

279868989 is a wasteful number, since it uses less digits than its factorization.

279868989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166267.

The product of its digits is 31352832, while the sum is 66.

The square root of 279868989 is about 16729.2853702721. The cubic root of 279868989 is about 654.1112114367. Note that the first 3 decimals are identical.

The spelling of 279868989 in words is "two hundred seventy-nine million, eight hundred sixty-eight thousand, nine hundred eighty-nine".