1640986723 has 2 divisors, whose sum is σ = 1640986724. Its totient is φ = 1640986722.

The previous prime is 1640986709. The next prime is 1640986729. The reversal of 1640986723 is 3276890461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640986723 - 2⁵ = 1640986691 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640986729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820493361 + 820493362.

It is an arithmetic number, because the mean of its divisors is an integer number (820493362).

Almost surely, 2^1640986723 is an apocalyptic number.

1640986723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640986723 is an equidigital number, since it uses as much as digits as its factorization.

1640986723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 1640986723 is about 40509.0943246081. The cubic root of 1640986723 is about 1179.5101679944.

The spelling of 1640986723 in words is "one billion, six hundred forty million, nine hundred eighty-six thousand, seven hundred twenty-three".