105240909 has 8 divisors (see below), whose sum is σ = 143584672. Its totient is φ = 68528880.

The previous prime is 105240907. The next prime is 105240937. The reversal of 105240909 is 909042501.

It is a happy number.

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

It is not a de Polignac number, because 105240909 - 2¹ = 105240907 is a prime.

It is a super-2 number, since 2×105240909² = 22151297854292562, 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 (105240907) 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, 407782 + ... + 408039.

It is an arithmetic number, because the mean of its divisors is an integer number (17948084).

Almost surely, 2^105240909 is an apocalyptic number.

It is an amenable number.

105240909 is a deficient number, since it is larger than the sum of its proper divisors (38343763).

105240909 is an equidigital number, since it uses as much as digits as its factorization.

105240909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815867.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 105240909 is about 10258.6991865441. The cubic root of 105240909 is about 472.1299271854.

The spelling of 105240909 in words is "one hundred five million, two hundred forty thousand, nine hundred nine".