1860866989 has 2 divisors, whose sum is σ = 1860866990. Its totient is φ = 1860866988.

The previous prime is 1860866951. The next prime is 1860867007. The reversal of 1860866989 is 9896680681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1727649225 + 133217764 = 41565^2 + 11542^2 .

It is a cyclic number.

It is not a de Polignac number, because 1860866989 - 2¹⁵ = 1860834221 is a prime.

It is a super-2 number, since 2×1860866989² = 6925651901499852242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1860866389) 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, 930433494 + 930433495.

It is an arithmetic number, because the mean of its divisors is an integer number (930433495).

Almost surely, 2^1860866989 is an apocalyptic number.

It is an amenable number.

1860866989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1860866989 is an equidigital number, since it uses as much as digits as its factorization.

1860866989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8957952, while the sum is 61.

The square root of 1860866989 is about 43137.7675477070. The cubic root of 1860866989 is about 1229.9999975764. Note that the first 5 decimals are identical.

The spelling of 1860866989 in words is "one billion, eight hundred sixty million, eight hundred sixty-six thousand, nine hundred eighty-nine".