1320825 has 24 divisors (see below), whose sum is σ = 2383776. Its totient is φ = 640000.

The previous prime is 1320811. The next prime is 1320859. The reversal of 1320825 is 5280231.

It is not a de Polignac number, because 1320825 - 2¹² = 1316729 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 25 + ... + 1625.

It is an arithmetic number, because the mean of its divisors is an integer number (99324).

2^1320825 is an apocalyptic number.

1320825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1320825 is a deficient number, since it is larger than the sum of its proper divisors (1062951).

1320825 is a wasteful number, since it uses less digits than its factorization.

1320825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625 (or 1620 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1320825 is about 1149.2715083913. The cubic root of 1320825 is about 109.7189796498.

It can be divided in two parts, 1320 and 825, that added together give a triangular number (2145 = T₆₅).

The spelling of 1320825 in words is "one million, three hundred twenty thousand, eight hundred twenty-five".