105643986 has 32 divisors (see below), whose sum is σ = 241781760. Its totient is φ = 30145296.

The previous prime is 105643981. The next prime is 105643997. The reversal of 105643986 is 689346501.

It is a super-2 number, since 2×105643986² = 22321303555936392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (105643981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54445 + ... + 56351.

It is an arithmetic number, because the mean of its divisors is an integer number (7555680).

Almost surely, 2^105643986 is an apocalyptic number.

105643986 is an abundant number, since it is smaller than the sum of its proper divisors (136137774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

105643986 is a wasteful number, since it uses less digits than its factorization.

105643986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 105643986 is about 10278.3260310228. The cubic root of 105643986 is about 472.7319182863.

The spelling of 105643986 in words is "one hundred five million, six hundred forty-three thousand, nine hundred eighty-six".