1680040823 has 2 divisors, whose sum is σ = 1680040824. Its totient is φ = 1680040822.

The previous prime is 1680040787. The next prime is 1680040889. The reversal of 1680040823 is 3280400861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680040823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1680040823.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680040123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840020411 + 840020412.

It is an arithmetic number, because the mean of its divisors is an integer number (840020412).

Almost surely, 2^1680040823 is an apocalyptic number.

1680040823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680040823 is an equidigital number, since it uses as much as digits as its factorization.

1680040823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1680040823 is about 40988.3010504217. The cubic root of 1680040823 is about 1188.7940193923.

The spelling of 1680040823 in words is "one billion, six hundred eighty million, forty thousand, eight hundred twenty-three".