1280630 has 16 divisors (see below), whose sum is σ = 2482704. Its totient is φ = 472800.

The previous prime is 1280623. The next prime is 1280633. The reversal of 1280630 is 360821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4796 + ... + 5055.

It is an arithmetic number, because the mean of its divisors is an integer number (155169).

2^1280630 is an apocalyptic number.

1280630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1280630 is a deficient number, since it is larger than the sum of its proper divisors (1202074).

1280630 is a wasteful number, since it uses less digits than its factorization.

1280630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9871.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1280630 is about 1131.6492389429. The cubic root of 1280630 is about 108.5945151077.

The spelling of 1280630 in words is "one million, two hundred eighty thousand, six hundred thirty".