25380805 has 4 divisors (see below), whose sum is σ = 30456972. Its totient is φ = 20304640.

The previous prime is 25380791. The next prime is 25380811. The reversal of 25380805 is 50808352.

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 14371681 + 11009124 = 3791^2 + 3318^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25380805 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent 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, 2538076 + ... + 2538085.

It is an arithmetic number, because the mean of its divisors is an integer number (7614243).

Almost surely, 2^25380805 is an apocalyptic number.

It is an amenable number.

25380805 is a deficient number, since it is larger than the sum of its proper divisors (5076167).

25380805 is an equidigital number, since it uses as much as digits as its factorization.

25380805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5076166.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 25380805 is about 5037.9365815778. The cubic root of 25380805 is about 293.8789396221.

The spelling of 25380805 in words is "twenty-five million, three hundred eighty thousand, eight hundred five".