279996813 has 12 divisors (see below), whose sum is σ = 413045568. Its totient is φ = 182692680.

The previous prime is 279996811. The next prime is 279996853. The reversal of 279996813 is 318699972.

It is not a de Polignac number, because 279996813 - 2¹ = 279996811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 279996813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (279996811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 330543 + ... + 331388.

It is an arithmetic number, because the mean of its divisors is an integer number (34420464).

Almost surely, 2^279996813 is an apocalyptic number.

It is an amenable number.

279996813 is a deficient number, since it is larger than the sum of its proper divisors (133048755).

279996813 is a wasteful number, since it uses less digits than its factorization.

279996813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661984 (or 661981 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 279996813 is about 16733.1053005711. The cubic root of 279996813 is about 654.2107799120.

The spelling of 279996813 in words is "two hundred seventy-nine million, nine hundred ninety-six thousand, eight hundred thirteen".