100243405 has 8 divisors (see below), whose sum is σ = 122562072. Its totient is φ = 78681408.

The previous prime is 100243393. The next prime is 100243417. The reversal of 100243405 is 504342001.

It is an interprime number because it is at equal distance from previous prime (100243393) and next prime (100243417).

It can be written as a sum of positive squares in 4 ways, for example, as 40475044 + 59768361 = 6362^2 + 7731^2 .

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 100243405 - 2⁹ = 100242893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188874 + ... + 189403.

It is an arithmetic number, because the mean of its divisors is an integer number (15320259).

Almost surely, 2^100243405 is an apocalyptic number.

It is an amenable number.

100243405 is a deficient number, since it is larger than the sum of its proper divisors (22318667).

100243405 is an equidigital number, since it uses as much as digits as its factorization.

100243405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378335.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 100243405 is about 10012.1628532500. The cubic root of 100243405 is about 464.5351735332.

Adding to 100243405 its reverse (504342001), we get a palindrome (604585406).

The spelling of 100243405 in words is "one hundred million, two hundred forty-three thousand, four hundred five".