25340405 has 12 divisors (see below), whose sum is σ = 30896460. Its totient is φ = 19952064.

The previous prime is 25340401. The next prime is 25340407. The reversal of 25340405 is 50404352.

It can be written as a sum of positive squares in 2 ways, for example, as 5189284 + 20151121 = 2278^2 + 4489^2 .

It is not a de Polignac number, because 25340405 - 2² = 25340401 is a prime.

It is a super-2 number, since 2×25340405² = 1284272251128050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25340401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21881 + ... + 23009.

It is an arithmetic number, because the mean of its divisors is an integer number (2574705).

Almost surely, 2^25340405 is an apocalyptic number.

It is an amenable number.

25340405 is a deficient number, since it is larger than the sum of its proper divisors (5556055).

25340405 is an equidigital number, since it uses as much as digits as its factorization.

25340405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 25340405 is about 5033.9254066782. The cubic root of 25340405 is about 293.7229291486.

Adding to 25340405 its reverse (50404352), we get a palindrome (75744757).

The spelling of 25340405 in words is "twenty-five million, three hundred forty thousand, four hundred five".