1864705693 has 2 divisors, whose sum is σ = 1864705694. Its totient is φ = 1864705692.

The previous prime is 1864705691. The next prime is 1864705699. The reversal of 1864705693 is 3965074681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1695627684 + 169078009 = 41178^2 + 13003^2 .

It is an emirp because it is prime and its reverse (3965074681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1864705693 - 2¹ = 1864705691 is a prime.

It is a super-2 number, since 2×1864705693² = 6954254643013220498, which contains 22 as substring.

Together with 1864705691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1864705691) 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, 932352846 + 932352847.

It is an arithmetic number, because the mean of its divisors is an integer number (932352847).

Almost surely, 2^1864705693 is an apocalyptic number.

It is an amenable number.

1864705693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864705693 is an equidigital number, since it uses as much as digits as its factorization.

1864705693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 1864705693 is about 43182.2381657088. The cubic root of 1864705693 is about 1230.8451883731.

The spelling of 1864705693 in words is "one billion, eight hundred sixty-four million, seven hundred five thousand, six hundred ninety-three".