1681245 has 12 divisors (see below), whose sum is σ = 2914236. Its totient is φ = 896640.

The previous prime is 1681241. The next prime is 1681247. The reversal of 1681245 is 5421861.

It can be written as a sum of positive squares in 2 ways, for example, as 887364 + 793881 = 942^2 + 891^2 .

It is not a de Polignac number, because 1681245 - 2² = 1681241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18636 + ... + 18725.

It is an arithmetic number, because the mean of its divisors is an integer number (242853).

2^1681245 is an apocalyptic number.

1681245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1681245 is a deficient number, since it is larger than the sum of its proper divisors (1232991).

1681245 is a wasteful number, since it uses less digits than its factorization.

1681245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37372 (or 37369 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1681245 is about 1296.6283199128. The cubic root of 1681245 is about 118.9077976091.

The spelling of 1681245 in words is "one million, six hundred eighty-one thousand, two hundred forty-five".