1282840 has 32 divisors (see below), whose sum is σ = 3109680. Its totient is φ = 473472.

The previous prime is 1282817. The next prime is 1282867. The reversal of 1282840 is 482821.

1282840 = T₂₃₃ + T₂₃₄ + ... + T₂₇₂.

It is a super-3 number, since 3×1282840³ = 6333426488430912000, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714 + ... + 1753.

2^1282840 is an apocalyptic number.

1282840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1282840 is an abundant number, since it is smaller than the sum of its proper divisors (1826840).

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

1282840 is a wasteful number, since it uses less digits than its factorization.

1282840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491 (or 2487 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 1282840 is about 1132.6252690100. The cubic root of 1282840 is about 108.6569468684.

The spelling of 1282840 in words is "one million, two hundred eighty-two thousand, eight hundred forty".