1680090403 has 4 divisors (see below), whose sum is σ = 1683391680. Its totient is φ = 1676789128.

The previous prime is 1680090323. The next prime is 1680090427. The reversal of 1680090403 is 3040900861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1680090403 - 2⁹ = 1680089891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680090473) 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, 1649875 + ... + 1650892.

It is an arithmetic number, because the mean of its divisors is an integer number (420847920).

Almost surely, 2^1680090403 is an apocalyptic number.

1680090403 is a deficient number, since it is larger than the sum of its proper divisors (3301277).

1680090403 is an equidigital number, since it uses as much as digits as its factorization.

1680090403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301276.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1680090403 is about 40988.9058526816. The cubic root of 1680090403 is about 1188.8057135184.

The spelling of 1680090403 in words is "one billion, six hundred eighty million, ninety thousand, four hundred three".