1279929998 has 16 divisors (see below), whose sum is σ = 1940526720. Its totient is φ = 633118200.

The previous prime is 1279929997. The next prime is 1279930021. The reversal of 1279929998 is 8999299721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279929997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79343 + ... + 94101.

It is an arithmetic number, because the mean of its divisors is an integer number (121282920).

Almost surely, 2^1279929998 is an apocalyptic number.

1279929998 is a deficient number, since it is larger than the sum of its proper divisors (660596722).

1279929998 is a wasteful number, since it uses less digits than its factorization.

1279929998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15223.

The product of its digits is 13226976, while the sum is 65.

The square root of 1279929998 is about 35776.1093189296. The cubic root of 1279929998 is about 1085.7472530832.

The spelling of 1279929998 in words is "one billion, two hundred seventy-nine million, nine hundred twenty-nine thousand, nine hundred ninety-eight".