1284625 has 16 divisors (see below), whose sum is σ = 1647360. Its totient is φ = 999600.

The previous prime is 1284623. The next prime is 1284631. The reversal of 1284625 is 5264821.

It is not a de Polignac number, because 1284625 - 2¹ = 1284623 is a prime.

It is a super-2 number, since 2×1284625² = 3300522781250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1284593 and 1284602.

It is not an unprimeable number, because it can be changed into a prime (1284623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5256 + ... + 5494.

It is an arithmetic number, because the mean of its divisors is an integer number (102960).

2^1284625 is an apocalyptic number.

It is an amenable number.

1284625 is a deficient number, since it is larger than the sum of its proper divisors (362735).

1284625 is an equidigital number, since it uses as much as digits as its factorization.

1284625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 287 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 1284625 is about 1133.4129873969. The cubic root of 1284625 is about 108.7073201967.

It can be divided in two parts, 128 and 4625, that added together give a triangular number (4753 = T₉₇).

The spelling of 1284625 in words is "one million, two hundred eighty-four thousand, six hundred twenty-five".