1279942478 has 16 divisors (see below), whose sum is σ = 2052591840. Its totient is φ = 596476416.

The previous prime is 1279942459. The next prime is 1279942511. The reversal of 1279942478 is 8742499721.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179243 + ... + 186246.

It is an arithmetic number, because the mean of its divisors is an integer number (128286990).

Almost surely, 2^1279942478 is an apocalyptic number.

1279942478 is a deficient number, since it is larger than the sum of its proper divisors (772649362).

1279942478 is a wasteful number, since it uses less digits than its factorization.

1279942478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365611.

The product of its digits is 2032128, while the sum is 53.

The square root of 1279942478 is about 35776.2837365761. The cubic root of 1279942478 is about 1085.7507819433.

The spelling of 1279942478 in words is "one billion, two hundred seventy-nine million, nine hundred forty-two thousand, four hundred seventy-eight".