105639866 has 8 divisors (see below), whose sum is σ = 163924020. Its totient is φ = 50998528.

The previous prime is 105639817. The next prime is 105639869. The reversal of 105639866 is 668936501.

It can be written as a sum of positive squares in 2 ways, for example, as 98505625 + 7134241 = 9925^2 + 2671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×105639866² = 22319562576995912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (105639869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910631 + ... + 910746.

Almost surely, 2^105639866 is an apocalyptic number.

105639866 is a deficient number, since it is larger than the sum of its proper divisors (58284154).

105639866 is a wasteful number, since it uses less digits than its factorization.

105639866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821408.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 105639866 is about 10278.1256073274. The cubic root of 105639866 is about 472.7257728637.

The spelling of 105639866 in words is "one hundred five million, six hundred thirty-nine thousand, eight hundred sixty-six".