1280340 has 48 divisors (see below), whose sum is σ = 3984960. Its totient is φ = 341280.

The previous prime is 1280333. The next prime is 1280371. The reversal of 1280340 is 430821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646 + ... + 1725.

It is an arithmetic number, because the mean of its divisors is an integer number (83020).

2^1280340 is an apocalyptic number.

1280340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280340 is an abundant number, since it is smaller than the sum of its proper divisors (2704620).

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

1280340 is a wasteful number, since it uses less digits than its factorization.

1280340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389 (or 2381 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1280340 is about 1131.5211001126. The cubic root of 1280340 is about 108.5863173751.

The spelling of 1280340 in words is "one million, two hundred eighty thousand, three hundred forty".