1279543878 has 80 divisors (see below), whose sum is σ = 2927597904. Its totient is φ = 417623040.

The previous prime is 1279543849. The next prime is 1279543883. The reversal of 1279543878 is 8783459721.

It is a happy number.

1279543878 is a `hidden beast` number, since 1 + 27 + 9 + 543 + 8 + 78 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1681018 + ... + 1681778.

Almost surely, 2^1279543878 is an apocalyptic number.

1279543878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1279543878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463798952).

1279543878 is an abundant number, since it is smaller than the sum of its proper divisors (1648054026).

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

1279543878 is a wasteful number, since it uses less digits than its factorization.

1279543878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979 (or 970 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The square root of 1279543878 is about 35770.7125732770. The cubic root of 1279543878 is about 1085.6380619832.

The spelling of 1279543878 in words is "one billion, two hundred seventy-nine million, five hundred forty-three thousand, eight hundred seventy-eight".