1287625 has 8 divisors (see below), whose sum is σ = 1607112. Its totient is φ = 1030000.

The previous prime is 1287623. The next prime is 1287661. The reversal of 1287625 is 5267821.

It can be written as a sum of positive squares in 4 ways, for example, as 8464 + 1279161 = 92^2 + 1131^2 .

It is not a de Polignac number, because 1287625 - 2¹ = 1287623 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287623) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5026 + ... + 5275.

It is an arithmetic number, because the mean of its divisors is an integer number (200889).

2^1287625 is an apocalyptic number.

It is an amenable number.

1287625 is a deficient number, since it is larger than the sum of its proper divisors (319487).

1287625 is an equidigital number, since it uses as much as digits as its factorization.

1287625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10316 (or 10306 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 1287625 is about 1134.7356520353. The cubic root of 1287625 is about 108.7918762407.

The spelling of 1287625 in words is "one million, two hundred eighty-seven thousand, six hundred twenty-five".