1284655679 has 4 divisors (see below), whose sum is σ = 1302253776. Its totient is φ = 1267057584.

The previous prime is 1284655667. The next prime is 1284655693. The reversal of 1284655679 is 9765564821.

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

It is a cyclic number.

It is not a de Polignac number, because 1284655679 - 2⁸ = 1284655423 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 1284655679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284657679) 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, 8798939 + ... + 8799084.

It is an arithmetic number, because the mean of its divisors is an integer number (325563444).

Almost surely, 2^1284655679 is an apocalyptic number.

1284655679 is a deficient number, since it is larger than the sum of its proper divisors (17598097).

1284655679 is an equidigital number, since it uses as much as digits as its factorization.

1284655679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17598096.

The product of its digits is 3628800, while the sum is 53.

The square root of 1284655679 is about 35842.0936748957. The cubic root of 1284655679 is about 1087.0818556088.

The spelling of 1284655679 in words is "one billion, two hundred eighty-four million, six hundred fifty-five thousand, six hundred seventy-nine".