1287100 has 36 divisors (see below), whose sum is σ = 2852248. Its totient is φ = 504000.

The previous prime is 1287071. The next prime is 1287101. The reversal of 1287100 is 17821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5995 + ... + 6205.

2^1287100 is an apocalyptic number.

1287100 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 1287100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426124).

1287100 is an abundant number, since it is smaller than the sum of its proper divisors (1565148).

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

1287100 is a wasteful number, since it uses less digits than its factorization.

1287100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1287100 is about 1134.5042970390. The cubic root of 1287100 is about 108.7770884209. Note that the first 3 decimals are identical.

The spelling of 1287100 in words is "one million, two hundred eighty-seven thousand, one hundred".