1681445 has 8 divisors (see below), whose sum is σ = 2024736. Its totient is φ = 1340496.

The previous prime is 1681423. The next prime is 1681469. The reversal of 1681445 is 5441861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1681445 - 2¹⁰ = 1680421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2294 + ... + 2936.

It is an arithmetic number, because the mean of its divisors is an integer number (253092).

2^1681445 is an apocalyptic number.

It is an amenable number.

1681445 is a deficient number, since it is larger than the sum of its proper divisors (343291).

1681445 is an equidigital number, since it uses as much as digits as its factorization.

1681445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171.

The product of its digits is 3840, while the sum is 29.

The square root of 1681445 is about 1296.7054407228. The cubic root of 1681445 is about 118.9125124913.

The spelling of 1681445 in words is "one million, six hundred eighty-one thousand, four hundred forty-five".