1279739945 has 16 divisors (see below), whose sum is σ = 1678743360. Its totient is φ = 928804800.

The previous prime is 1279739933. The next prime is 1279739947. The reversal of 1279739945 is 5499379721.

It is not a de Polignac number, because 1279739945 - 2¹⁴ = 1279723561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1279739947) 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, 3311 + ... + 50699.

It is an arithmetic number, because the mean of its divisors is an integer number (104921460).

Almost surely, 2^1279739945 is an apocalyptic number.

It is an amenable number.

1279739945 is a deficient number, since it is larger than the sum of its proper divisors (399003415).

1279739945 is a wasteful number, since it uses less digits than its factorization.

1279739945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47896.

The product of its digits is 4286520, while the sum is 56.

The square root of 1279739945 is about 35773.4530762687. The cubic root of 1279739945 is about 1085.6935106292.

The spelling of 1279739945 in words is "one billion, two hundred seventy-nine million, seven hundred thirty-nine thousand, nine hundred forty-five".