1287090 has 80 divisors (see below), whose sum is σ = 3972672. Its totient is φ = 292896.

The previous prime is 1287071. The next prime is 1287101. The reversal of 1287090 is 907821.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 5557 + ... + 5783.

2^1287090 is an apocalyptic number.

1287090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 1134×1135.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1986336).

1287090 is an abundant number, since it is smaller than the sum of its proper divisors (2685582).

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

1287090 is a wasteful number, since it uses less digits than its factorization.

1287090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1287090 is about 1134.4998898193. The cubic root of 1287090 is about 108.7768067091.

The spelling of 1287090 in words is "one million, two hundred eighty-seven thousand, ninety".