1279046340 has 576 divisors, whose sum is σ = 5019356160. Its totient is φ = 258785280.

The previous prime is 1279046299. The next prime is 1279046347. The reversal of 1279046340 is 436409721.

1279046340 is a `hidden beast` number, since 1 + 279 + 0 + 46 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1279046295 and 1279046304.

It is not an unprimeable number, because it can be changed into a prime (1279046347) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 16190421 + ... + 16190499.

It is an arithmetic number, because the mean of its divisors is an integer number (8714160).

It is a vampire number, since it can be written as 31746 ⋅ 40290 (with its own digits).

Almost surely, 2^1279046340 is an apocalyptic number.

1279046340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1279046340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2509678080).

1279046340 is an abundant number, since it is smaller than the sum of its proper divisors (3740309820).

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

1279046340 is a wasteful number, since it uses less digits than its factorization.

1279046340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 1279046340 is about 35763.7573529404. The cubic root of 1279046340 is about 1085.4973305281.

The spelling of 1279046340 in words is "one billion, two hundred seventy-nine million, forty-six thousand, three hundred forty".