100840305 has 8 divisors (see below), whose sum is σ = 161344512. Its totient is φ = 53781488.

The previous prime is 100840283. The next prime is 100840307. The reversal of 100840305 is 503048001.

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 100840305 - 2⁵ = 100840273 is a prime.

It is a super-2 number, since 2×100840305² = 20337534224986050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100840307) 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, 3361329 + ... + 3361358.

It is an arithmetic number, because the mean of its divisors is an integer number (20168064).

Almost surely, 2^100840305 is an apocalyptic number.

100840305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100840305 is a deficient number, since it is larger than the sum of its proper divisors (60504207).

100840305 is an equidigital number, since it uses as much as digits as its factorization.

100840305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722695.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 100840305 is about 10041.9273548458. The cubic root of 100840305 is about 465.4553753867.

Adding to 100840305 its reverse (503048001), we get a palindrome (603888306).

The spelling of 100840305 in words is "one hundred million, eight hundred forty thousand, three hundred five".