105819989 has 8 divisors (see below), whose sum is σ = 115807968. Its totient is φ = 95893360.

The previous prime is 105819977. The next prime is 105819991. The reversal of 105819989 is 989918501.

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

It is a cyclic number.

It is not a de Polignac number, because 105819989 - 2²⁴ = 89042773 is a prime.

It is a super-2 number, since 2×105819989² = 22395740143920242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105819589) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11687 + ... + 18660.

It is an arithmetic number, because the mean of its divisors is an integer number (14475996).

Almost surely, 2^105819989 is an apocalyptic number.

It is an amenable number.

105819989 is a deficient number, since it is larger than the sum of its proper divisors (9987979).

105819989 is a wasteful number, since it uses less digits than its factorization.

105819989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30675.

The product of its (nonzero) digits is 233280, while the sum is 50.

The square root of 105819989 is about 10286.8843193651. The cubic root of 105819989 is about 472.9942966026.

The spelling of 105819989 in words is "one hundred five million, eight hundred nineteen thousand, nine hundred eighty-nine".