10001905 has 4 divisors (see below), whose sum is σ = 12002292. Its totient is φ = 8001520.

The previous prime is 10001903. The next prime is 10001921. The reversal of 10001905 is 50910001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50910001 = 139 ⋅366259.

It can be written as a sum of positive squares in 2 ways, for example, as 1216609 + 8785296 = 1103^2 + 2964^2 .

It is not a de Polignac number, because 10001905 - 2¹ = 10001903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10001903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000186 + ... + 1000195.

It is an arithmetic number, because the mean of its divisors is an integer number (3000573).

Almost surely, 2^10001905 is an apocalyptic number.

It is an amenable number.

10001905 is a deficient number, since it is larger than the sum of its proper divisors (2000387).

10001905 is an equidigital number, since it uses as much as digits as its factorization.

10001905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2000386.

The product of its (nonzero) digits is 45, while the sum is 16.

The square root of 10001905 is about 3162.5788527719. The cubic root of 10001905 is about 215.4571487948.

Adding to 10001905 its reverse (50910001), we get a palindrome (60911906).

The spelling of 10001905 in words is "ten million, one thousand, nine hundred five".