1720866827 has 2 divisors, whose sum is σ = 1720866828. Its totient is φ = 1720866826.

The previous prime is 1720866787. The next prime is 1720866839. The reversal of 1720866827 is 7286680271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1720866827 - 2⁸ = 1720866571 is a prime.

It is a super-2 number, since 2×1720866827² = 5922765272538095858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1720866527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860433413 + 860433414.

It is an arithmetic number, because the mean of its divisors is an integer number (860433414).

Almost surely, 2^1720866827 is an apocalyptic number.

1720866827 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720866827 is an equidigital number, since it uses as much as digits as its factorization.

1720866827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 1720866827 is about 41483.3319177715. The cubic root of 1720866827 is about 1198.3465252772.

The spelling of 1720866827 in words is "one billion, seven hundred twenty million, eight hundred sixty-six thousand, eight hundred twenty-seven".