25090405 has 4 divisors (see below), whose sum is σ = 30108492. Its totient is φ = 20072320.

The previous prime is 25090391. The next prime is 25090409. The reversal of 25090405 is 50409052.

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 8946081 + 16144324 = 2991^2 + 4018^2 .

It is not a de Polignac number, because 25090405 - 2⁷ = 25090277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25090405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25090409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2509036 + ... + 2509045.

It is an arithmetic number, because the mean of its divisors is an integer number (7527123).

Almost surely, 2^25090405 is an apocalyptic number.

It is an amenable number.

25090405 is a deficient number, since it is larger than the sum of its proper divisors (5018087).

25090405 is an equidigital number, since it uses as much as digits as its factorization.

25090405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5018086.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 25090405 is about 5009.0323416804. The cubic root of 25090405 is about 292.7538109143.

Adding to 25090405 its reverse (50409052), we get a palindrome (75499457).

The spelling of 25090405 in words is "twenty-five million, ninety thousand, four hundred five".