1640846843 has 2 divisors, whose sum is σ = 1640846844. Its totient is φ = 1640846842.

The previous prime is 1640846803. The next prime is 1640846861. The reversal of 1640846843 is 3486480461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640846843 - 2²⁴ = 1624069627 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640846794 and 1640846803.

It is not a weakly prime, because it can be changed into another prime (1640846803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820423421 + 820423422.

It is an arithmetic number, because the mean of its divisors is an integer number (820423422).

Almost surely, 2^1640846843 is an apocalyptic number.

1640846843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640846843 is an equidigital number, since it uses as much as digits as its factorization.

1640846843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 1640846843 is about 40507.3677619270. The cubic root of 1640846843 is about 1179.4766526774.

The spelling of 1640846843 in words is "one billion, six hundred forty million, eight hundred forty-six thousand, eight hundred forty-three".