105218986 has 4 divisors (see below), whose sum is σ = 157828482. Its totient is φ = 52609492.

The previous prime is 105218983. The next prime is 105218987. The reversal of 105218986 is 689812501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 104755225 + 463761 = 10235^2 + 681^2 .

It is a super-2 number, since 2×105218986² = 22142070029736392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (105218983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26304745 + ... + 26304748.

Almost surely, 2^105218986 is an apocalyptic number.

105218986 is a deficient number, since it is larger than the sum of its proper divisors (52609496).

105218986 is an equidigital number, since it uses as much as digits as its factorization.

105218986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52609495.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 105218986 is about 10257.6306231020. The cubic root of 105218986 is about 472.0971413822.

The spelling of 105218986 in words is "one hundred five million, two hundred eighteen thousand, nine hundred eighty-six".