1680351 has 4 divisors (see below), whose sum is σ = 2240472. Its totient is φ = 1120232.

The previous prime is 1680323. The next prime is 1680359. The reversal of 1680351 is 1530861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1530861 = 3 ⋅510287.

It is a cyclic number.

It is not a de Polignac number, because 1680351 - 2⁵ = 1680319 is a prime.

It is a D-number.

1680351 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280056 + ... + 280061.

It is an arithmetic number, because the mean of its divisors is an integer number (560118).

2^1680351 is an apocalyptic number.

1680351 is a deficient number, since it is larger than the sum of its proper divisors (560121).

1680351 is an equidigital number, since it uses as much as digits as its factorization.

1680351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560120.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1680351 is about 1296.2835337996. The cubic root of 1680351 is about 118.8867175129.

The spelling of 1680351 in words is "one million, six hundred eighty thousand, three hundred fifty-one".