1278918 has 24 divisors (see below), whose sum is σ = 2792088. Its totient is φ = 423072.

The previous prime is 1278911. The next prime is 1278983. The reversal of 1278918 is 8198721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3930 + ... + 4242.

It is an arithmetic number, because the mean of its divisors is an integer number (116337).

2^1278918 is an apocalyptic number.

1278918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1278918 is an abundant number, since it is smaller than the sum of its proper divisors (1513170).

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

1278918 is a wasteful number, since it uses less digits than its factorization.

1278918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 545 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 1278918 is about 1130.8925678419. The cubic root of 1278918 is about 108.5461022908.

It can be divided in two parts, 127 and 8918, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 1278918 in words is "one million, two hundred seventy-eight thousand, nine hundred eighteen".