105999646 has 4 divisors (see below), whose sum is σ = 158999472. Its totient is φ = 52999822.

The previous prime is 105999599. The next prime is 105999667. The reversal of 105999646 is 646999501.

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

It is a super-2 number, since 2×105999646² = 22471849904250632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 105999646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26499910 + ... + 26499913.

It is an arithmetic number, because the mean of its divisors is an integer number (39749868).

Almost surely, 2^105999646 is an apocalyptic number.

105999646 is a deficient number, since it is larger than the sum of its proper divisors (52999826).

105999646 is an equidigital number, since it uses as much as digits as its factorization.

105999646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52999825.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 105999646 is about 10295.6129492129. The cubic root of 105999646 is about 473.2618222765.

The spelling of 105999646 in words is "one hundred five million, nine hundred ninety-nine thousand, six hundred forty-six".