1279664139 has 16 divisors (see below), whose sum is σ = 1849178912. Its totient is φ = 782466048.

The previous prime is 1279664131. The next prime is 1279664143. The reversal of 1279664139 is 9314669721.

It is not a de Polignac number, because 1279664139 - 2³ = 1279664131 is a prime.

It is a super-2 number, since 2×1279664139² = 3275080617285222642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279664131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98374 + ... + 110619.

It is an arithmetic number, because the mean of its divisors is an integer number (115573682).

Almost surely, 2^1279664139 is an apocalyptic number.

1279664139 is a deficient number, since it is larger than the sum of its proper divisors (569514773).

1279664139 is a wasteful number, since it uses less digits than its factorization.

1279664139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209166.

The product of its digits is 489888, while the sum is 48.

The square root of 1279664139 is about 35772.3935318843. The cubic root of 1279664139 is about 1085.6720730166.

The spelling of 1279664139 in words is "one billion, two hundred seventy-nine million, six hundred sixty-four thousand, one hundred thirty-nine".