1287320 has 16 divisors (see below), whose sum is σ = 2896560. Its totient is φ = 514912.

The previous prime is 1287289. The next prime is 1287323. The reversal of 1287320 is 237821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16052 + ... + 16131.

It is an arithmetic number, because the mean of its divisors is an integer number (181035).

2^1287320 is an apocalyptic number.

1287320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287320 is an abundant number, since it is smaller than the sum of its proper divisors (1609240).

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

1287320 is a wasteful number, since it uses less digits than its factorization.

1287320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32194 (or 32190 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1287320 is about 1134.6012515417. The cubic root of 1287320 is about 108.7832857110.

The spelling of 1287320 in words is "one million, two hundred eighty-seven thousand, three hundred twenty".