1279208645 has 32 divisors (see below), whose sum is σ = 1861622784. Its totient is φ = 831052800.

The previous prime is 1279208629. The next prime is 1279208663. The reversal of 1279208645 is 5468029721.

It is a happy number.

It is not a de Polignac number, because 1279208645 - 2⁴ = 1279208629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1279208596 and 1279208605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6692 + ... + 51021.

It is an arithmetic number, because the mean of its divisors is an integer number (58175712).

Almost surely, 2^1279208645 is an apocalyptic number.

It is an amenable number.

1279208645 is a deficient number, since it is larger than the sum of its proper divisors (582414139).

1279208645 is a wasteful number, since it uses less digits than its factorization.

1279208645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57773.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1279208645 is about 35766.0264077518. The cubic root of 1279208645 is about 1085.5432434314.

The spelling of 1279208645 in words is "one billion, two hundred seventy-nine million, two hundred eight thousand, six hundred forty-five".