1279328139 has 12 divisors (see below), whose sum is σ = 1873233336. Its totient is φ = 841201632.

The previous prime is 1279328137. The next prime is 1279328143. The reversal of 1279328139 is 9318239721.

It is not a de Polignac number, because 1279328139 - 2¹ = 1279328137 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1279328094 and 1279328103.

It is not an unprimeable number, because it can be changed into a prime (1279328137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 972957 + ... + 974270.

It is an arithmetic number, because the mean of its divisors is an integer number (156102778).

Almost surely, 2^1279328139 is an apocalyptic number.

1279328139 is a deficient number, since it is larger than the sum of its proper divisors (593905197).

1279328139 is a wasteful number, since it uses less digits than its factorization.

1279328139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947306 (or 1947303 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 1279328139 is about 35767.6968646291. The cubic root of 1279328139 is about 1085.5770434597.

The spelling of 1279328139 in words is "one billion, two hundred seventy-nine million, three hundred twenty-eight thousand, one hundred thirty-nine".