1278989118 has 72 divisors (see below), whose sum is σ = 3225235104. Its totient is φ = 364763520.

The previous prime is 1278989113. The next prime is 1278989147. The reversal of 1278989118 is 8119898721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278989111) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19755 + ... + 54297.

It is an arithmetic number, because the mean of its divisors is an integer number (44794932).

Almost surely, 2^1278989118 is an apocalyptic number.

1278989118 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 1278989118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612617552).

1278989118 is an abundant number, since it is smaller than the sum of its proper divisors (1946245986).

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

1278989118 is a wasteful number, since it uses less digits than its factorization.

1278989118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34590 (or 34576 counting only the distinct ones).

The product of its digits is 580608, while the sum is 54.

The square root of 1278989118 is about 35762.9573441571. The cubic root of 1278989118 is about 1085.4811426198.

The spelling of 1278989118 in words is "one billion, two hundred seventy-eight million, nine hundred eighty-nine thousand, one hundred eighteen".