25001905 has 4 divisors (see below), whose sum is σ = 30002292. Its totient is φ = 20001520.

The previous prime is 25001881. The next prime is 25001953. The reversal of 25001905 is 50910052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16638241 + 8363664 = 4079^2 + 2892^2 .

It is not a de Polignac number, because 25001905 - 2¹⁵ = 24969137 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500186 + ... + 2500195.

It is an arithmetic number, because the mean of its divisors is an integer number (7500573).

Almost surely, 2^25001905 is an apocalyptic number.

It is an amenable number.

25001905 is a deficient number, since it is larger than the sum of its proper divisors (5000387).

25001905 is an equidigital number, since it uses as much as digits as its factorization.

25001905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5000386.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 25001905 is about 5000.1904963711. The cubic root of 25001905 is about 292.4092006377.

Adding to 25001905 its reverse (50910052), we get a palindrome (75911957).

The spelling of 25001905 in words is "twenty-five million, one thousand, nine hundred five".