1287725 has 12 divisors (see below), whose sum is σ = 1681440. Its totient is φ = 975600.

The previous prime is 1287707. The next prime is 1287731. The reversal of 1287725 is 5277821.

It is not a de Polignac number, because 1287725 - 2⁶ = 1287661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1287691 and 1287700.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 881 + ... + 1830.

It is an arithmetic number, because the mean of its divisors is an integer number (140120).

2^1287725 is an apocalyptic number.

It is an amenable number.

1287725 is a deficient number, since it is larger than the sum of its proper divisors (393715).

1287725 is a wasteful number, since it uses less digits than its factorization.

1287725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740 (or 2735 counting only the distinct ones).

The product of its digits is 7840, while the sum is 32.

The square root of 1287725 is about 1134.7797143058. The cubic root of 1287725 is about 108.7946925125.

The spelling of 1287725 in words is "one million, two hundred eighty-seven thousand, seven hundred twenty-five".