1278340 has 48 divisors (see below), whose sum is σ = 3209472. Its totient is φ = 418176.

The previous prime is 1278337. The next prime is 1278341. The reversal of 1278340 is 438721.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1278341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3022 + ... + 3418.

It is an arithmetic number, because the mean of its divisors is an integer number (66864).

2^1278340 is an apocalyptic number.

1278340 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 1278340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1604736).

1278340 is an abundant number, since it is smaller than the sum of its proper divisors (1931132).

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

1278340 is a wasteful number, since it uses less digits than its factorization.

1278340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 434 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1278340 is about 1130.6369886042. The cubic root of 1278340 is about 108.5297475542.

The spelling of 1278340 in words is "one million, two hundred seventy-eight thousand, three hundred forty".