1287117 has 32 divisors (see below), whose sum is σ = 2172800. Its totient is φ = 746496.

The previous prime is 1287109. The next prime is 1287131. The reversal of 1287117 is 7117821.

It is not a de Polignac number, because 1287117 - 2³ = 1287109 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6573 + ... + 6765.

It is an arithmetic number, because the mean of its divisors is an integer number (67900).

2^1287117 is an apocalyptic number.

It is an amenable number.

1287117 is a deficient number, since it is larger than the sum of its proper divisors (885683).

1287117 is a wasteful number, since it uses less digits than its factorization.

1287117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 228 counting only the distinct ones).

The product of its digits is 784, while the sum is 27.

The square root of 1287117 is about 1134.5117892733. The cubic root of 1287117 is about 108.7775673276. Note that the first 3 decimals are identical.

The spelling of 1287117 in words is "one million, two hundred eighty-seven thousand, one hundred seventeen".