1287125 has 16 divisors (see below), whose sum is σ = 1837056. Its totient is φ = 882000.

The previous prime is 1287109. The next prime is 1287131. The reversal of 1287125 is 5217821.

It is not a de Polignac number, because 1287125 - 2⁴ = 1287109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1287094 and 1287103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140 + ... + 1610.

It is an arithmetic number, because the mean of its divisors is an integer number (114816).

2^1287125 is an apocalyptic number.

It is an amenable number.

1287125 is a deficient number, since it is larger than the sum of its proper divisors (549931).

1287125 is an equidigital number, since it uses as much as digits as its factorization.

1287125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493 (or 1483 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1287125 is about 1134.5153150134. The cubic root of 1287125 is about 108.7777926940. Note that the first 4 decimals are identical.

The spelling of 1287125 in words is "one million, two hundred eighty-seven thousand, one hundred twenty-five".