25425405 has 24 divisors (see below), whose sum is σ = 44211960. Its totient is φ = 13516800.

The previous prime is 25425403. The next prime is 25425451. The reversal of 25425405 is 50452452.

25425405 is a `hidden beast` number, since 254 + 2 + 5 + 405 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2643876 + 22781529 = 1626^2 + 4773^2 .

It is not a de Polignac number, because 25425405 - 2¹ = 25425403 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25425403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17341 + ... + 18749.

It is an arithmetic number, because the mean of its divisors is an integer number (1842165).

Almost surely, 2^25425405 is an apocalyptic number.

It is an amenable number.

25425405 is a deficient number, since it is larger than the sum of its proper divisors (18786555).

25425405 is a wasteful number, since it uses less digits than its factorization.

25425405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821 (or 1818 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 25425405 is about 5042.3610541095. The cubic root of 25425405 is about 294.0509768610.

Adding to 25425405 its reverse (50452452), we get a palindrome (75877857).

The spelling of 25425405 in words is "twenty-five million, four hundred twenty-five thousand, four hundred five".