25805145 has 16 divisors (see below), whose sum is σ = 41565312. Its totient is φ = 13670400.

The previous prime is 25805119. The next prime is 25805147. The reversal of 25805145 is 54150852.

It is not a de Polignac number, because 25805145 - 2⁶ = 25805081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25805147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3432 + ... + 7961.

It is an arithmetic number, because the mean of its divisors is an integer number (2597832).

Almost surely, 2^25805145 is an apocalyptic number.

It is an amenable number.

25805145 is a deficient number, since it is larger than the sum of its proper divisors (15760167).

25805145 is a wasteful number, since it uses less digits than its factorization.

25805145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11552.

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 25805145 is about 5079.8764748761. The cubic root of 25805145 is about 295.5076770003.

Adding to 25805145 its reverse (54150852), we get a palindrome (79955997).

The spelling of 25805145 in words is "twenty-five million, eight hundred five thousand, one hundred forty-five".