279945649 has 4 divisors (see below), whose sum is σ = 280039536. Its totient is φ = 279851764.

The previous prime is 279945643. The next prime is 279945661. The reversal of 279945649 is 946549972.

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 279945649 - 2²¹ = 277848497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 279945649.

It is not an unprimeable number, because it can be changed into a prime (279945643) 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, 42319 + ... + 48484.

It is an arithmetic number, because the mean of its divisors is an integer number (70009884).

Almost surely, 2^279945649 is an apocalyptic number.

It is an amenable number.

279945649 is a deficient number, since it is larger than the sum of its proper divisors (93887).

279945649 is an equidigital number, since it uses as much as digits as its factorization.

279945649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93886.

The product of its digits is 4898880, while the sum is 55.

The square root of 279945649 is about 16731.5764051090. The cubic root of 279945649 is about 654.1709293640.

The spelling of 279945649 in words is "two hundred seventy-nine million, nine hundred forty-five thousand, six hundred forty-nine".