1278198 has 12 divisors (see below), whose sum is σ = 2769468. Its totient is φ = 426060.

The previous prime is 1278197. The next prime is 1278203. The reversal of 1278198 is 8918721.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35488 + ... + 35523.

It is an arithmetic number, because the mean of its divisors is an integer number (230789).

2^1278198 is an apocalyptic number.

1278198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1278198 is an abundant number, since it is smaller than the sum of its proper divisors (1491270).

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

1278198 is a wasteful number, since it uses less digits than its factorization.

1278198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71019 (or 71016 counting only the distinct ones).

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

The square root of 1278198 is about 1130.5741904006. The cubic root of 1278198 is about 108.5257288542.

It can be divided in two parts, 12 and 78198, that added together give a triangular number (78210 = T₃₉₅).

The spelling of 1278198 in words is "one million, two hundred seventy-eight thousand, one hundred ninety-eight".