1279279120 has 80 divisors (see below), whose sum is σ = 3578163840. Its totient is φ = 415521792.

The previous prime is 1279279081. The next prime is 1279279151. The reversal of 1279279120 is 219729721.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49477 + ... + 70756.

It is an arithmetic number, because the mean of its divisors is an integer number (44727048).

Almost surely, 2^1279279120 is an apocalyptic number.

1279279120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1279279120 is an abundant number, since it is smaller than the sum of its proper divisors (2298884720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1279279120 is a wasteful number, since it uses less digits than its factorization.

1279279120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120272 (or 120266 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 1279279120 is about 35767.0116168516. The cubic root of 1279279120 is about 1085.5631782183.

The spelling of 1279279120 in words is "one billion, two hundred seventy-nine million, two hundred seventy-nine thousand, one hundred twenty".