1287500 has 36 divisors (see below), whose sum is σ = 2843568. Its totient is φ = 510000.

The previous prime is 1287499. The next prime is 1287511. The reversal of 1287500 is 57821.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12449 + ... + 12551.

It is an arithmetic number, because the mean of its divisors is an integer number (78988).

2^1287500 is an apocalyptic number.

1287500 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 1287500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421784).

1287500 is an abundant number, since it is smaller than the sum of its proper divisors (1556068).

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

1287500 is an equidigital number, since it uses as much as digits as its factorization.

1287500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 1287500 is about 1134.6805717910. The cubic root of 1287500 is about 108.7883556959.

The spelling of 1287500 in words is "one million, two hundred eighty-seven thousand, five hundred".