25805434 has 4 divisors (see below), whose sum is σ = 38708154. Its totient is φ = 12902716.

The previous prime is 25805431. The next prime is 25805443. The reversal of 25805434 is 43450852.

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

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 5130225 = 4547^2 + 2265^2 .

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 junction number, because it is equal to n+sod(n) for n = 25805396 and 25805405.

It is not an unprimeable number, because it can be changed into a prime (25805431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6451357 + ... + 6451360.

Almost surely, 2^25805434 is an apocalyptic number.

25805434 is a deficient number, since it is larger than the sum of its proper divisors (12902720).

25805434 is a wasteful number, since it uses less digits than its factorization.

25805434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12902719.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 25805434 is about 5079.9049203701. The cubic root of 25805434 is about 295.5087801576.

The spelling of 25805434 in words is "twenty-five million, eight hundred five thousand, four hundred thirty-four".