1680953 has 4 divisors (see below), whose sum is σ = 1689600. Its totient is φ = 1672308.

The previous prime is 1680929. The next prime is 1680961. The reversal of 1680953 is 3590861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3590861 = 349 ⋅10289.

It is a cyclic number.

It is not a de Polignac number, because 1680953 - 2⁸ = 1680697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1680983) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4025 + ... + 4422.

It is an arithmetic number, because the mean of its divisors is an integer number (422400).

2^1680953 is an apocalyptic number.

It is an amenable number.

1680953 is a deficient number, since it is larger than the sum of its proper divisors (8647).

1680953 is an equidigital number, since it uses as much as digits as its factorization.

1680953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8646.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1680953 is about 1296.5157152923. The cubic root of 1680953 is about 118.9009132095.

The spelling of 1680953 in words is "one million, six hundred eighty thousand, nine hundred fifty-three".