1279799787 has 48 divisors (see below), whose sum is σ = 2085357312. Its totient is φ = 694774080.

The previous prime is 1279799767. The next prime is 1279799819. The reversal of 1279799787 is 7879979721.

It is not a de Polignac number, because 1279799787 - 2⁶ = 1279799723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1279799767) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 529612 + ... + 532022.

It is an arithmetic number, because the mean of its divisors is an integer number (43444944).

Almost surely, 2^1279799787 is an apocalyptic number.

1279799787 is a deficient number, since it is larger than the sum of its proper divisors (805557525).

1279799787 is a wasteful number, since it uses less digits than its factorization.

1279799787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608 (or 2601 counting only the distinct ones).

The product of its digits is 28005264, while the sum is 66.

The square root of 1279799787 is about 35774.2894688350. The cubic root of 1279799787 is about 1085.7104330929.

The spelling of 1279799787 in words is "one billion, two hundred seventy-nine million, seven hundred ninety-nine thousand, seven hundred eighty-seven".